databases/04 Data_munging_as_taught.ipynb

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  {
   "cells": [
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "#Number munging:  vectors, Pandas, probabilities"
     ]
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "#this is the more or less raw version of what we did today. I've added a few comments here and there to eliminate confusion."
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [],
     "language": "python",
     "metadata": {},
     "outputs": []
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "# Render our plots inline\n",
      "%matplotlib inline\n",
      "\n",
      "import pandas as pd\n",
      "import matplotlib.pyplot as plt\n",
      "import numpy as np\n",
      "\n",
      "pd.set_option('display.mpl_style', 'default') # Make the graphs a bit prettier\n",
      "plt.rcParams['figure.figsize'] = (15, 5)\n",
      "\n",
      "\n"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 1
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "#get our data--temporary home--these will disappear soon\n",
      "!wget http://www.columbia.edu/~mj340/ml-100k.tar.gz"
     ],
     "language": "python",
     "metadata": {},
     "outputs": []
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "!wget http://www.columbia.edu/~mj340/HMXPC13_DI_v2_5-14-14.csv.gz"
     ],
     "language": "python",
     "metadata": {},
     "outputs": []
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "!gunzip HMXPC13_DI_v2_5-14-14.csv.gz"
     ],
     "language": "python",
     "metadata": {},
     "outputs": []
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "!tar -zxvf ml-100k.tar.gz"
     ],
     "language": "python",
     "metadata": {},
     "outputs": []
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "\n",
      "\n",
      "#Our ritual: Exploratory data analysis\n",
      "\n",
      "\n",
      "> Exploratory data analysis (EDA) seeks to reveal structure, or simple descriptions, in data. We look at numbers and graphs and try to find patterns.  \n",
      "    - Persi Diaconis, \"Theories of Data Analysis: From Magical Thinking Through Classical statistics\"\n",
      "\n",
      "> . . . proceeding via a \u2018dustbowl\u2019 empiricism is dangerous at worst and foolish at best . . . . The purely empirical approach is particularly dangerous in an age when computers and packaged programs are readily available, since there is temptation to substitute immediate empirical analysis for more analytic thought and theory building.\n",
      "    - Einhorn, \u201cAlchemy in the Behavioral Sciences,\u201d 1972\n",
      "\n",
      ">. . . we can view the techniques of EDA as a ritual designed to reveal patters in a data set. Thus, we may believe that naturally occurring data sets contain structure, that EDA is a useful vehicle for revealing the structure. . . . If we make no attempt to check whether the structure could have arisen by chance, and tend to accept the findinds as gospel, then the ritual comes close to magical thinking. ... a controlled form of magical thinking--in the guise of 'working hypothesis'--is a basic ingredient of scientific progress. \n",
      "    - Persi Diaconis, \"Theories of Data Analysis: From Magical Thinking Through Classical statistics\"\n",
      "\n",
      "#From data to databases to data mining\n",
      "- move from accessing and manipulating data to performing ever more complicated *queries* on our data\n",
      "\n",
      "\n",
      "#`Pandas` first-line `python` tool for EDA\n",
      "- rich data structures\n",
      "- powerful ways to slice, dice, reformate, fix, and eliminate data\n",
      "    - taste of what can do\n",
      "- rich queries like databases\n",
      "    \n"
     ]
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "#`Pandas`: charismatic megafauna"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "import pandas as pd"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 3
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "CPI={\"2010\": 218.056, \"2011\": 224.939, \"2012\": 229.594, \"2013\": 232.957} #http://www.bls.gov/cpi/home.htm"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 5
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "CPI[\"2011\"]"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 6,
       "text": [
        "224.939"
       ]
      }
     ],
     "prompt_number": 6
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "The CPI provides \"a measure of the average change over time in the prices paid by urban consumers for a market basket of consumer goods and services.\" A *higher* number means it costs more to buy the same goods. It was set to 100 in 1982-4.\n",
      "\n",
      "We can thus use it to measure the effects of inflation on the value of houses in a toy example."
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "CPI_series=pd.Series(CPI)"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 7
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "CPI_series"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 8,
       "text": [
        "2010    218.056\n",
        "2011    224.939\n",
        "2012    229.594\n",
        "2013    232.957\n",
        "dtype: float64"
       ]
      }
     ],
     "prompt_number": 8
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "House_sale_mean={\"2010\":100000, \"2011\":100000, \"2012\":100000, \"2013\":100000}"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 9
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "house_sale_series=pd.Series(House_sale_mean)"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 10
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "house_sale_series"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 11,
       "text": [
        "2010    100000\n",
        "2011    100000\n",
        "2012    100000\n",
        "2013    100000\n",
        "dtype: int64"
       ]
      }
     ],
     "prompt_number": 11
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "(house_sale_series/CPI_series)"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 13,
       "text": [
        "2010    458.597791\n",
        "2011    444.564971\n",
        "2012    435.551452\n",
        "2013    429.263770\n",
        "dtype: float64"
       ]
      }
     ],
     "prompt_number": 13
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "(house_sale_series/CPI_series)*100"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 15,
       "text": [
        "2010    45859.779139\n",
        "2011    44456.497095\n",
        "2012    43555.145169\n",
        "2013    42926.376971\n",
        "dtype: float64"
       ]
      }
     ],
     "prompt_number": 15
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "inflation_adjusted=(house_sale_series/CPI_series)*100"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 16
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "inflation_adjusted.plot(title=\"Sorry Kids! Blame X, where X is the guy in office\")"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 18,
       "text": [
        "<matplotlib.axes.AxesSubplot at 0x7fd6358056d0>"
       ]
      },
      {
       "output_type": "stream",
       "stream": "stderr",
       "text": [
        "/usr/lib/pymodules/python2.7/matplotlib/font_manager.py:1246: UserWarning: findfont: Could not match :family=Bitstream Vera Sans:style=normal:variant=normal:weight=normal:stretch=normal:size=x-large. Returning /usr/share/matplotlib/mpl-data/fonts/ttf/cmb10.ttf\n",
        "  UserWarning)\n"
       ]
      },
      {
       "metadata": {},
       "output_type": "display_data",
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FBAQAgGXPu2t98MEHuPfee3Hp0iWsXbsW//vf/3Do0CEA5j6y6upqm2NrPF8hRJOLvcY7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\niLAHAAAAAIvQ/wNidwuQzh5CUwAAAABJRU5ErkJggg==\n",
       "text": [
        "<matplotlib.figure.Figure at 0x7fd63578f510>"
       ]
      }
     ],
     "prompt_number": 18
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "Dataframes"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "df=pd.read_csv('./HMXPC13_DI_v2_5-14-14.csv', sep=',')\n"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 19
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "##Note that df is the name of our datastructure, not the function to make something into a dataframe, which is pd.DataFrame. I failed to explain this accurately in class. So df[\"blah\"] is indexing on the particular dataframe df, not a function df on blah."
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "df"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "html": [
        "<div style=\"max-height:1000px;max-width:1500px;overflow:auto;\">\n",
        "<table border=\"1\" class=\"dataframe\">\n",
        "  <thead>\n",
        "    <tr style=\"text-align: right;\">\n",
        "      <th></th>\n",
        "      <th>course_id</th>\n",
        "      <th>userid_DI</th>\n",
        "      <th>registered</th>\n",
        "      <th>viewed</th>\n",
        "      <th>explored</th>\n",
        "      <th>certified</th>\n",
        "      <th>final_cc_cname_DI</th>\n",
        "      <th>LoE_DI</th>\n",
        "      <th>YoB</th>\n",
        "      <th>gender</th>\n",
        "      <th>grade</th>\n",
        "      <th>start_time_DI</th>\n",
        "      <th>last_event_DI</th>\n",
        "      <th>nevents</th>\n",
        "      <th>ndays_act</th>\n",
        "      <th>nplay_video</th>\n",
        "      <th>nchapters</th>\n",
        "      <th>nforum_posts</th>\n",
        "      <th>roles</th>\n",
        "      <th>incomplete_flag</th>\n",
        "    </tr>\n",
        "  </thead>\n",
        "  <tbody>\n",
        "    <tr>\n",
        "      <th>0     </th>\n",
        "      <td>  HarvardX/CB22x/2013_Spring</td>\n",
        "      <td> MHxPC130442623</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>  United States</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2012-12-19</td>\n",
        "      <td> 2013-11-17</td>\n",
        "      <td> NaN</td>\n",
        "      <td>  9</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>1     </th>\n",
        "      <td>         HarvardX/CS50x/2012</td>\n",
        "      <td> MHxPC130442623</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>  United States</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2012-10-15</td>\n",
        "      <td>        NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>  9</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>2     </th>\n",
        "      <td>  HarvardX/CB22x/2013_Spring</td>\n",
        "      <td> MHxPC130275857</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>  United States</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2013-02-08</td>\n",
        "      <td> 2013-11-17</td>\n",
        "      <td> NaN</td>\n",
        "      <td> 16</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>3     </th>\n",
        "      <td>         HarvardX/CS50x/2012</td>\n",
        "      <td> MHxPC130275857</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>  United States</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2012-09-17</td>\n",
        "      <td>        NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td> 16</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>4     </th>\n",
        "      <td>  HarvardX/ER22x/2013_Spring</td>\n",
        "      <td> MHxPC130275857</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>  United States</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2012-12-19</td>\n",
        "      <td>        NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td> 16</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>5     </th>\n",
        "      <td>   HarvardX/PH207x/2012_Fall</td>\n",
        "      <td> MHxPC130275857</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td>  United States</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2012-09-17</td>\n",
        "      <td> 2013-05-23</td>\n",
        "      <td> 502</td>\n",
        "      <td> 16</td>\n",
        "      <td> 50</td>\n",
        "      <td> 12</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>6     </th>\n",
        "      <td> HarvardX/PH278x/2013_Spring</td>\n",
        "      <td> MHxPC130275857</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>  United States</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2013-02-08</td>\n",
        "      <td>        NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td> 16</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>7     </th>\n",
        "      <td>  HarvardX/CB22x/2013_Spring</td>\n",
        "      <td> MHxPC130539455</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>         France</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2013-01-01</td>\n",
        "      <td> 2013-05-14</td>\n",
        "      <td>  42</td>\n",
        "      <td>  6</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  3</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>8     </th>\n",
        "      <td>  HarvardX/CB22x/2013_Spring</td>\n",
        "      <td> MHxPC130088379</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>  United States</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2013-02-18</td>\n",
        "      <td> 2013-03-17</td>\n",
        "      <td>  70</td>\n",
        "      <td>  3</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  3</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>9     </th>\n",
        "      <td>         HarvardX/CS50x/2012</td>\n",
        "      <td> MHxPC130088379</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>  United States</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2012-10-20</td>\n",
        "      <td>        NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td> 12</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  3</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>10    </th>\n",
        "      <td>  HarvardX/ER22x/2013_Spring</td>\n",
        "      <td> MHxPC130088379</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>  United States</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2013-02-23</td>\n",
        "      <td> 2013-06-14</td>\n",
        "      <td>  17</td>\n",
        "      <td>  2</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  2</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>11    </th>\n",
        "      <td>  HarvardX/ER22x/2013_Spring</td>\n",
        "      <td> MHxPC130198098</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>  United States</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2013-06-17</td>\n",
        "      <td> 2013-06-17</td>\n",
        "      <td>  32</td>\n",
        "      <td>  1</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  3</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>12    </th>\n",
        "      <td>  HarvardX/CB22x/2013_Spring</td>\n",
        "      <td> MHxPC130024894</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>  United States</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td> 0.07</td>\n",
        "      <td> 2013-01-24</td>\n",
        "      <td> 2013-08-03</td>\n",
        "      <td> 175</td>\n",
        "      <td>  9</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  7</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>13    </th>\n",
        "      <td>         HarvardX/CS50x/2012</td>\n",
        "      <td> MHxPC130024894</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>  United States</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2013-06-27</td>\n",
        "      <td>        NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>  2</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  2</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>14    </th>\n",
        "      <td>  HarvardX/ER22x/2013_Spring</td>\n",
        "      <td> MHxPC130024894</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>  United States</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2012-12-19</td>\n",
        "      <td> 2013-08-17</td>\n",
        "      <td>  78</td>\n",
        "      <td>  5</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  4</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>15    </th>\n",
        "      <td>   HarvardX/PH207x/2012_Fall</td>\n",
        "      <td> MHxPC130024894</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>  United States</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2012-07-26</td>\n",
        "      <td> 2013-01-16</td>\n",
        "      <td>  75</td>\n",
        "      <td> 14</td>\n",
        "      <td>  5</td>\n",
        "      <td>  2</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>16    </th>\n",
        "      <td> HarvardX/PH278x/2013_Spring</td>\n",
        "      <td> MHxPC130024894</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>  United States</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2013-07-30</td>\n",
        "      <td> 2013-08-27</td>\n",
        "      <td>  11</td>\n",
        "      <td>  2</td>\n",
        "      <td>  2</td>\n",
        "      <td>  1</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>17    </th>\n",
        "      <td>         HarvardX/CS50x/2012</td>\n",
        "      <td> MHxPC130080986</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>  United States</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2012-10-15</td>\n",
        "      <td>        NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td> 11</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>18    </th>\n",
        "      <td>   HarvardX/PH207x/2012_Fall</td>\n",
        "      <td> MHxPC130080986</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>  United States</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2012-10-25</td>\n",
        "      <td> 2012-12-04</td>\n",
        "      <td>  56</td>\n",
        "      <td> 11</td>\n",
        "      <td>  1</td>\n",
        "      <td>  2</td>\n",
        "      <td> 1</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>19    </th>\n",
        "      <td>         HarvardX/CS50x/2012</td>\n",
        "      <td> MHxPC130063375</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>  Unknown/Other</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2012-10-19</td>\n",
        "      <td>        NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>20    </th>\n",
        "      <td>         HarvardX/CS50x/2012</td>\n",
        "      <td> MHxPC130094371</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>  United States</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2013-03-03</td>\n",
        "      <td> 2013-03-03</td>\n",
        "      <td>   7</td>\n",
        "      <td>  1</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  2</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>21    </th>\n",
        "      <td>         HarvardX/CS50x/2012</td>\n",
        "      <td> MHxPC130229084</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>         Mexico</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2012-10-15</td>\n",
        "      <td>        NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>22    </th>\n",
        "      <td>         HarvardX/CS50x/2012</td>\n",
        "      <td> MHxPC130300925</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>  United States</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2012-10-24</td>\n",
        "      <td>        NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>  2</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>23    </th>\n",
        "      <td>  HarvardX/ER22x/2013_Spring</td>\n",
        "      <td> MHxPC130300925</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>  United States</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2012-12-20</td>\n",
        "      <td> 2013-05-18</td>\n",
        "      <td>  15</td>\n",
        "      <td>  2</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  2</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>24    </th>\n",
        "      <td>         HarvardX/CS50x/2012</td>\n",
        "      <td> MHxPC130417650</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>      Australia</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2012-10-29</td>\n",
        "      <td> 2013-03-04</td>\n",
        "      <td>   1</td>\n",
        "      <td>  1</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  2</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>25    </th>\n",
        "      <td>         HarvardX/CS50x/2012</td>\n",
        "      <td> MHxPC130506580</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>  United States</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2012-09-04</td>\n",
        "      <td>        NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>26    </th>\n",
        "      <td>         HarvardX/CS50x/2012</td>\n",
        "      <td> MHxPC130298257</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>  United States</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2012-09-05</td>\n",
        "      <td>        NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  3</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>27    </th>\n",
        "      <td>         HarvardX/CS50x/2012</td>\n",
        "      <td> MHxPC130500569</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>  United States</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2012-10-22</td>\n",
        "      <td> 2013-03-30</td>\n",
        "      <td>   6</td>\n",
        "      <td>  1</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  5</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>28    </th>\n",
        "      <td>         HarvardX/CS50x/2012</td>\n",
        "      <td> MHxPC130466479</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>  Unknown/Other</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2013-01-07</td>\n",
        "      <td>        NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>29    </th>\n",
        "      <td>  HarvardX/CB22x/2013_Spring</td>\n",
        "      <td> MHxPC130340959</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>  United States</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td> 0.05</td>\n",
        "      <td> 2013-02-11</td>\n",
        "      <td> 2013-04-06</td>\n",
        "      <td> 285</td>\n",
        "      <td>  8</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  4</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>...</th>\n",
        "      <td>...</td>\n",
        "      <td>...</td>\n",
        "      <td>...</td>\n",
        "      <td>...</td>\n",
        "      <td>...</td>\n",
        "      <td>...</td>\n",
        "      <td>...</td>\n",
        "      <td>...</td>\n",
        "      <td>...</td>\n",
        "      <td>...</td>\n",
        "      <td>...</td>\n",
        "      <td>...</td>\n",
        "      <td>...</td>\n",
        "      <td>...</td>\n",
        "      <td>...</td>\n",
        "      <td>...</td>\n",
        "      <td>...</td>\n",
        "      <td>...</td>\n",
        "      <td>...</td>\n",
        "      <td>...</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641108</th>\n",
        "      <td>     MITx/6.002x/2013_Spring</td>\n",
        "      <td> MHxPC130140735</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>  United States</td>\n",
        "      <td> Bachelor's</td>\n",
        "      <td> 1991</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td>  59</td>\n",
        "      <td>  1</td>\n",
        "      <td>  5</td>\n",
        "      <td>  3</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641109</th>\n",
        "      <td>      MITx/6.00x/2013_Spring</td>\n",
        "      <td> MHxPC130493130</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> United Kingdom</td>\n",
        "      <td>   Master's</td>\n",
        "      <td> 1977</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td>        NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  2</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641110</th>\n",
        "      <td>      MITx/6.00x/2013_Spring</td>\n",
        "      <td> MHxPC130400592</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>   Other Europe</td>\n",
        "      <td>  Secondary</td>\n",
        "      <td> 1992</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 395</td>\n",
        "      <td>  1</td>\n",
        "      <td> 51</td>\n",
        "      <td>  4</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641111</th>\n",
        "      <td>      MITx/6.00x/2013_Spring</td>\n",
        "      <td> MHxPC130109892</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>          India</td>\n",
        "      <td>  Secondary</td>\n",
        "      <td> 1995</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td>  49</td>\n",
        "      <td>  1</td>\n",
        "      <td> 14</td>\n",
        "      <td>  2</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641112</th>\n",
        "      <td>     MITx/14.73x/2013_Spring</td>\n",
        "      <td> MHxPC130183007</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>          India</td>\n",
        "      <td>   Master's</td>\n",
        "      <td> 1985</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td>        NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641113</th>\n",
        "      <td>     MITx/8.MReV/2013_Summer</td>\n",
        "      <td> MHxPC130261281</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>          India</td>\n",
        "      <td>  Secondary</td>\n",
        "      <td> 1994</td>\n",
        "      <td>   m</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td>   8</td>\n",
        "      <td>  1</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641114</th>\n",
        "      <td>      MITx/6.00x/2013_Spring</td>\n",
        "      <td> MHxPC130481990</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>          India</td>\n",
        "      <td> Bachelor's</td>\n",
        "      <td> 1989</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td>  22</td>\n",
        "      <td>  1</td>\n",
        "      <td>  5</td>\n",
        "      <td>  1</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641115</th>\n",
        "      <td>      MITx/6.00x/2013_Spring</td>\n",
        "      <td> MHxPC130528581</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>  United States</td>\n",
        "      <td> Bachelor's</td>\n",
        "      <td> 1990</td>\n",
        "      <td>   f</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td>   2</td>\n",
        "      <td>  1</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  3</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641116</th>\n",
        "      <td>     MITx/14.73x/2013_Spring</td>\n",
        "      <td> MHxPC130555418</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>  Unknown/Other</td>\n",
        "      <td> Bachelor's</td>\n",
        "      <td> 1988</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td>        NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641117</th>\n",
        "      <td>     MITx/6.002x/2013_Spring</td>\n",
        "      <td> MHxPC130408810</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>          India</td>\n",
        "      <td>  Secondary</td>\n",
        "      <td> 1993</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td>   2</td>\n",
        "      <td>  1</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  3</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641118</th>\n",
        "      <td>      MITx/6.00x/2013_Spring</td>\n",
        "      <td> MHxPC130040184</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>  United States</td>\n",
        "      <td>  Secondary</td>\n",
        "      <td> 1991</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td>        NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641119</th>\n",
        "      <td>     MITx/6.002x/2013_Spring</td>\n",
        "      <td> MHxPC130566049</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>   Other Europe</td>\n",
        "      <td>   Master's</td>\n",
        "      <td> 1982</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td>   2</td>\n",
        "      <td>  1</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  2</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641120</th>\n",
        "      <td>     MITx/8.MReV/2013_Summer</td>\n",
        "      <td> MHxPC130374105</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>          India</td>\n",
        "      <td> Bachelor's</td>\n",
        "      <td> 1992</td>\n",
        "      <td>   m</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td>  49</td>\n",
        "      <td>  1</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641121</th>\n",
        "      <td>      MITx/6.00x/2013_Spring</td>\n",
        "      <td> MHxPC130282999</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>   Other Europe</td>\n",
        "      <td>   Master's</td>\n",
        "      <td> 1979</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td>        NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  7</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641122</th>\n",
        "      <td>     MITx/8.MReV/2013_Summer</td>\n",
        "      <td> MHxPC130556398</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>          India</td>\n",
        "      <td> Bachelor's</td>\n",
        "      <td> 1985</td>\n",
        "      <td>   m</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td>   1</td>\n",
        "      <td>  1</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641123</th>\n",
        "      <td>      MITx/6.00x/2013_Spring</td>\n",
        "      <td> MHxPC130573334</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>          Spain</td>\n",
        "      <td> Bachelor's</td>\n",
        "      <td> 1989</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td>   1</td>\n",
        "      <td>  1</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641124</th>\n",
        "      <td>      MITx/6.00x/2013_Spring</td>\n",
        "      <td> MHxPC130505931</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>          India</td>\n",
        "      <td>  Secondary</td>\n",
        "      <td> 1995</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td>  59</td>\n",
        "      <td>  1</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  2</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641125</th>\n",
        "      <td>     MITx/6.002x/2013_Spring</td>\n",
        "      <td> MHxPC130280976</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>  United States</td>\n",
        "      <td> Bachelor's</td>\n",
        "      <td>  NaN</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td>   2</td>\n",
        "      <td>  1</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641126</th>\n",
        "      <td>      MITx/6.00x/2013_Spring</td>\n",
        "      <td> MHxPC130137331</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>  United States</td>\n",
        "      <td>  Secondary</td>\n",
        "      <td> 1992</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 251</td>\n",
        "      <td>  1</td>\n",
        "      <td> 77</td>\n",
        "      <td>  4</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641127</th>\n",
        "      <td>     MITx/6.002x/2013_Spring</td>\n",
        "      <td> MHxPC130271624</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>          India</td>\n",
        "      <td> Bachelor's</td>\n",
        "      <td> 1989</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td>   1</td>\n",
        "      <td>  1</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641128</th>\n",
        "      <td>     MITx/14.73x/2013_Spring</td>\n",
        "      <td> MHxPC130256541</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>  United States</td>\n",
        "      <td>   Master's</td>\n",
        "      <td> 1982</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td>  51</td>\n",
        "      <td>  1</td>\n",
        "      <td>  1</td>\n",
        "      <td>  1</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641129</th>\n",
        "      <td>      MITx/6.00x/2013_Spring</td>\n",
        "      <td> MHxPC130021638</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>  Unknown/Other</td>\n",
        "      <td> Bachelor's</td>\n",
        "      <td> 1988</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td>        NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641130</th>\n",
        "      <td>     MITx/14.73x/2013_Spring</td>\n",
        "      <td> MHxPC130591057</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>         Canada</td>\n",
        "      <td> Bachelor's</td>\n",
        "      <td>  NaN</td>\n",
        "      <td>   f</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td>   6</td>\n",
        "      <td>  1</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641131</th>\n",
        "      <td>      MITx/8.02x/2013_Spring</td>\n",
        "      <td> MHxPC130226305</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>  Unknown/Other</td>\n",
        "      <td> Bachelor's</td>\n",
        "      <td> 1988</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td>  11</td>\n",
        "      <td>  1</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  2</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641132</th>\n",
        "      <td>     MITx/6.002x/2013_Spring</td>\n",
        "      <td> MHxPC130030805</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>       Pakistan</td>\n",
        "      <td>   Master's</td>\n",
        "      <td> 1989</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td>  29</td>\n",
        "      <td>  1</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641133</th>\n",
        "      <td>      MITx/6.00x/2013_Spring</td>\n",
        "      <td> MHxPC130184108</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>         Canada</td>\n",
        "      <td> Bachelor's</td>\n",
        "      <td> 1991</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td>  97</td>\n",
        "      <td>  1</td>\n",
        "      <td>  4</td>\n",
        "      <td>  2</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641134</th>\n",
        "      <td>      MITx/6.00x/2013_Spring</td>\n",
        "      <td> MHxPC130359782</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>   Other Europe</td>\n",
        "      <td> Bachelor's</td>\n",
        "      <td> 1991</td>\n",
        "      <td>   f</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td>   1</td>\n",
        "      <td>  1</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641135</th>\n",
        "      <td>     MITx/6.002x/2013_Spring</td>\n",
        "      <td> MHxPC130098513</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>  United States</td>\n",
        "      <td>  Doctorate</td>\n",
        "      <td> 1979</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td>   1</td>\n",
        "      <td>  1</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641136</th>\n",
        "      <td>      MITx/6.00x/2013_Spring</td>\n",
        "      <td> MHxPC130098513</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>  United States</td>\n",
        "      <td>  Doctorate</td>\n",
        "      <td> 1979</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td>  74</td>\n",
        "      <td>  1</td>\n",
        "      <td> 14</td>\n",
        "      <td>  1</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641137</th>\n",
        "      <td>      MITx/8.02x/2013_Spring</td>\n",
        "      <td> MHxPC130098513</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>  United States</td>\n",
        "      <td>  Doctorate</td>\n",
        "      <td> 1979</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td>        NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>  1</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "    </tr>\n",
        "  </tbody>\n",
        "</table>\n",
        "<p>641138 rows \u00d7 20 columns</p>\n",
        "</div>"
       ],
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 20,
       "text": [
        "                          course_id       userid_DI  registered  viewed  \\\n",
        "0        HarvardX/CB22x/2013_Spring  MHxPC130442623           1       0   \n",
        "1               HarvardX/CS50x/2012  MHxPC130442623           1       1   \n",
        "2        HarvardX/CB22x/2013_Spring  MHxPC130275857           1       0   \n",
        "3               HarvardX/CS50x/2012  MHxPC130275857           1       0   \n",
        "4        HarvardX/ER22x/2013_Spring  MHxPC130275857           1       0   \n",
        "5         HarvardX/PH207x/2012_Fall  MHxPC130275857           1       1   \n",
        "6       HarvardX/PH278x/2013_Spring  MHxPC130275857           1       0   \n",
        "7        HarvardX/CB22x/2013_Spring  MHxPC130539455           1       1   \n",
        "8        HarvardX/CB22x/2013_Spring  MHxPC130088379           1       1   \n",
        "9               HarvardX/CS50x/2012  MHxPC130088379           1       1   \n",
        "10       HarvardX/ER22x/2013_Spring  MHxPC130088379           1       1   \n",
        "11       HarvardX/ER22x/2013_Spring  MHxPC130198098           1       1   \n",
        "12       HarvardX/CB22x/2013_Spring  MHxPC130024894           1       1   \n",
        "13              HarvardX/CS50x/2012  MHxPC130024894           1       1   \n",
        "14       HarvardX/ER22x/2013_Spring  MHxPC130024894           1       1   \n",
        "15        HarvardX/PH207x/2012_Fall  MHxPC130024894           1       1   \n",
        "16      HarvardX/PH278x/2013_Spring  MHxPC130024894           1       1   \n",
        "17              HarvardX/CS50x/2012  MHxPC130080986           1       1   \n",
        "18        HarvardX/PH207x/2012_Fall  MHxPC130080986           1       1   \n",
        "19              HarvardX/CS50x/2012  MHxPC130063375           1       1   \n",
        "20              HarvardX/CS50x/2012  MHxPC130094371           1       1   \n",
        "21              HarvardX/CS50x/2012  MHxPC130229084           1       1   \n",
        "22              HarvardX/CS50x/2012  MHxPC130300925           1       1   \n",
        "23       HarvardX/ER22x/2013_Spring  MHxPC130300925           1       1   \n",
        "24              HarvardX/CS50x/2012  MHxPC130417650           1       1   \n",
        "25              HarvardX/CS50x/2012  MHxPC130506580           1       0   \n",
        "26              HarvardX/CS50x/2012  MHxPC130298257           1       0   \n",
        "27              HarvardX/CS50x/2012  MHxPC130500569           1       1   \n",
        "28              HarvardX/CS50x/2012  MHxPC130466479           1       1   \n",
        "29       HarvardX/CB22x/2013_Spring  MHxPC130340959           1       1   \n",
        "...                             ...             ...         ...     ...   \n",
        "641108      MITx/6.002x/2013_Spring  MHxPC130140735           1       1   \n",
        "641109       MITx/6.00x/2013_Spring  MHxPC130493130           1       0   \n",
        "641110       MITx/6.00x/2013_Spring  MHxPC130400592           1       1   \n",
        "641111       MITx/6.00x/2013_Spring  MHxPC130109892           1       1   \n",
        "641112      MITx/14.73x/2013_Spring  MHxPC130183007           1       0   \n",
        "641113      MITx/8.MReV/2013_Summer  MHxPC130261281           1       1   \n",
        "641114       MITx/6.00x/2013_Spring  MHxPC130481990           1       1   \n",
        "641115       MITx/6.00x/2013_Spring  MHxPC130528581           1       0   \n",
        "641116      MITx/14.73x/2013_Spring  MHxPC130555418           1       0   \n",
        "641117      MITx/6.002x/2013_Spring  MHxPC130408810           1       0   \n",
        "641118       MITx/6.00x/2013_Spring  MHxPC130040184           1       0   \n",
        "641119      MITx/6.002x/2013_Spring  MHxPC130566049           1       0   \n",
        "641120      MITx/8.MReV/2013_Summer  MHxPC130374105           1       1   \n",
        "641121       MITx/6.00x/2013_Spring  MHxPC130282999           1       0   \n",
        "641122      MITx/8.MReV/2013_Summer  MHxPC130556398           1       0   \n",
        "641123       MITx/6.00x/2013_Spring  MHxPC130573334           1       0   \n",
        "641124       MITx/6.00x/2013_Spring  MHxPC130505931           1       1   \n",
        "641125      MITx/6.002x/2013_Spring  MHxPC130280976           1       0   \n",
        "641126       MITx/6.00x/2013_Spring  MHxPC130137331           1       1   \n",
        "641127      MITx/6.002x/2013_Spring  MHxPC130271624           1       0   \n",
        "641128      MITx/14.73x/2013_Spring  MHxPC130256541           1       1   \n",
        "641129       MITx/6.00x/2013_Spring  MHxPC130021638           1       0   \n",
        "641130      MITx/14.73x/2013_Spring  MHxPC130591057           1       0   \n",
        "641131       MITx/8.02x/2013_Spring  MHxPC130226305           1       0   \n",
        "641132      MITx/6.002x/2013_Spring  MHxPC130030805           1       1   \n",
        "641133       MITx/6.00x/2013_Spring  MHxPC130184108           1       1   \n",
        "641134       MITx/6.00x/2013_Spring  MHxPC130359782           1       0   \n",
        "641135      MITx/6.002x/2013_Spring  MHxPC130098513           1       0   \n",
        "641136       MITx/6.00x/2013_Spring  MHxPC130098513           1       1   \n",
        "641137       MITx/8.02x/2013_Spring  MHxPC130098513           1       0   \n",
        "\n",
        "        explored  certified final_cc_cname_DI      LoE_DI   YoB gender grade  \\\n",
        "0              0          0     United States         NaN   NaN    NaN     0   \n",
        "1              0          0     United States         NaN   NaN    NaN     0   \n",
        "2              0          0     United States         NaN   NaN    NaN     0   \n",
        "3              0          0     United States         NaN   NaN    NaN     0   \n",
        "4              0          0     United States         NaN   NaN    NaN     0   \n",
        "5              1          0     United States         NaN   NaN    NaN     0   \n",
        "6              0          0     United States         NaN   NaN    NaN     0   \n",
        "7              0          0            France         NaN   NaN    NaN     0   \n",
        "8              0          0     United States         NaN   NaN    NaN     0   \n",
        "9              0          0     United States         NaN   NaN    NaN     0   \n",
        "10             0          0     United States         NaN   NaN    NaN     0   \n",
        "11             0          0     United States         NaN   NaN    NaN     0   \n",
        "12             0          0     United States         NaN   NaN    NaN  0.07   \n",
        "13             0          0     United States         NaN   NaN    NaN     0   \n",
        "14             0          0     United States         NaN   NaN    NaN     0   \n",
        "15             0          0     United States         NaN   NaN    NaN     0   \n",
        "16             0          0     United States         NaN   NaN    NaN     0   \n",
        "17             0          0     United States         NaN   NaN    NaN     0   \n",
        "18             0          0     United States         NaN   NaN    NaN     0   \n",
        "19             0          0     Unknown/Other         NaN   NaN    NaN     0   \n",
        "20             0          0     United States         NaN   NaN    NaN     0   \n",
        "21             0          0            Mexico         NaN   NaN    NaN     0   \n",
        "22             0          0     United States         NaN   NaN    NaN     0   \n",
        "23             0          0     United States         NaN   NaN    NaN     0   \n",
        "24             0          0         Australia         NaN   NaN    NaN     0   \n",
        "25             0          0     United States         NaN   NaN    NaN     0   \n",
        "26             0          0     United States         NaN   NaN    NaN     0   \n",
        "27             0          0     United States         NaN   NaN    NaN     0   \n",
        "28             0          0     Unknown/Other         NaN   NaN    NaN     0   \n",
        "29             0          0     United States         NaN   NaN    NaN  0.05   \n",
        "...          ...        ...               ...         ...   ...    ...   ...   \n",
        "641108         0          0     United States  Bachelor's  1991      m   NaN   \n",
        "641109         0          0    United Kingdom    Master's  1977      m   NaN   \n",
        "641110         0          0      Other Europe   Secondary  1992      m   NaN   \n",
        "641111         0          0             India   Secondary  1995      m   NaN   \n",
        "641112         0          0             India    Master's  1985      m   NaN   \n",
        "641113         0          0             India   Secondary  1994      m     0   \n",
        "641114         0          0             India  Bachelor's  1989      m   NaN   \n",
        "641115         0          0     United States  Bachelor's  1990      f   NaN   \n",
        "641116         0          0     Unknown/Other  Bachelor's  1988      m   NaN   \n",
        "641117         0          0             India   Secondary  1993      m   NaN   \n",
        "641118         0          0     United States   Secondary  1991      m   NaN   \n",
        "641119         0          0      Other Europe    Master's  1982      m   NaN   \n",
        "641120         0          0             India  Bachelor's  1992      m     0   \n",
        "641121         0          0      Other Europe    Master's  1979      m   NaN   \n",
        "641122         0          0             India  Bachelor's  1985      m     0   \n",
        "641123         0          0             Spain  Bachelor's  1989      m   NaN   \n",
        "641124         0          0             India   Secondary  1995      m   NaN   \n",
        "641125         0          0     United States  Bachelor's   NaN      m   NaN   \n",
        "641126         0          0     United States   Secondary  1992      m   NaN   \n",
        "641127         0          0             India  Bachelor's  1989      m   NaN   \n",
        "641128         0          0     United States    Master's  1982      m   NaN   \n",
        "641129         0          0     Unknown/Other  Bachelor's  1988      m   NaN   \n",
        "641130         0          0            Canada  Bachelor's   NaN      f   NaN   \n",
        "641131         0          0     Unknown/Other  Bachelor's  1988      m   NaN   \n",
        "641132         0          0          Pakistan    Master's  1989      m   NaN   \n",
        "641133         0          0            Canada  Bachelor's  1991      m   NaN   \n",
        "641134         0          0      Other Europe  Bachelor's  1991      f   NaN   \n",
        "641135         0          0     United States   Doctorate  1979      m   NaN   \n",
        "641136         0          0     United States   Doctorate  1979      m   NaN   \n",
        "641137         0          0     United States   Doctorate  1979      m   NaN   \n",
        "\n",
        "       start_time_DI last_event_DI  nevents  ndays_act  nplay_video  \\\n",
        "0         2012-12-19    2013-11-17      NaN          9          NaN   \n",
        "1         2012-10-15           NaN      NaN          9          NaN   \n",
        "2         2013-02-08    2013-11-17      NaN         16          NaN   \n",
        "3         2012-09-17           NaN      NaN         16          NaN   \n",
        "4         2012-12-19           NaN      NaN         16          NaN   \n",
        "5         2012-09-17    2013-05-23      502         16           50   \n",
        "6         2013-02-08           NaN      NaN         16          NaN   \n",
        "7         2013-01-01    2013-05-14       42          6          NaN   \n",
        "8         2013-02-18    2013-03-17       70          3          NaN   \n",
        "9         2012-10-20           NaN      NaN         12          NaN   \n",
        "10        2013-02-23    2013-06-14       17          2          NaN   \n",
        "11        2013-06-17    2013-06-17       32          1          NaN   \n",
        "12        2013-01-24    2013-08-03      175          9          NaN   \n",
        "13        2013-06-27           NaN      NaN          2          NaN   \n",
        "14        2012-12-19    2013-08-17       78          5          NaN   \n",
        "15        2012-07-26    2013-01-16       75         14            5   \n",
        "16        2013-07-30    2013-08-27       11          2            2   \n",
        "17        2012-10-15           NaN      NaN         11          NaN   \n",
        "18        2012-10-25    2012-12-04       56         11            1   \n",
        "19        2012-10-19           NaN      NaN        NaN          NaN   \n",
        "20        2013-03-03    2013-03-03        7          1          NaN   \n",
        "21        2012-10-15           NaN      NaN        NaN          NaN   \n",
        "22        2012-10-24           NaN      NaN          2          NaN   \n",
        "23        2012-12-20    2013-05-18       15          2          NaN   \n",
        "24        2012-10-29    2013-03-04        1          1          NaN   \n",
        "25        2012-09-04           NaN      NaN        NaN          NaN   \n",
        "26        2012-09-05           NaN      NaN        NaN          NaN   \n",
        "27        2012-10-22    2013-03-30        6          1          NaN   \n",
        "28        2013-01-07           NaN      NaN        NaN          NaN   \n",
        "29        2013-02-11    2013-04-06      285          8          NaN   \n",
        "...              ...           ...      ...        ...          ...   \n",
        "641108    2013-09-07    2013-09-07       59          1            5   \n",
        "641109    2013-09-07           NaN      NaN        NaN          NaN   \n",
        "641110    2013-09-07    2013-09-07      395          1           51   \n",
        "641111    2013-09-07    2013-09-07       49          1           14   \n",
        "641112    2013-09-07           NaN      NaN        NaN          NaN   \n",
        "641113    2013-09-07    2013-09-07        8          1          NaN   \n",
        "641114    2013-09-07    2013-09-07       22          1            5   \n",
        "641115    2013-09-07    2013-09-07        2          1          NaN   \n",
        "641116    2013-09-07           NaN      NaN        NaN          NaN   \n",
        "641117    2013-09-07    2013-09-07        2          1          NaN   \n",
        "641118    2013-09-07           NaN      NaN        NaN          NaN   \n",
        "641119    2013-09-07    2013-09-07        2          1          NaN   \n",
        "641120    2013-09-07    2013-09-07       49          1          NaN   \n",
        "641121    2013-09-07           NaN      NaN        NaN          NaN   \n",
        "641122    2013-09-07    2013-09-07        1          1          NaN   \n",
        "641123    2013-09-07    2013-09-07        1          1          NaN   \n",
        "641124    2013-09-07    2013-09-07       59          1          NaN   \n",
        "641125    2013-09-07    2013-09-07        2          1          NaN   \n",
        "641126    2013-09-07    2013-09-07      251          1           77   \n",
        "641127    2013-09-07    2013-09-07        1          1          NaN   \n",
        "641128    2013-09-07    2013-09-07       51          1            1   \n",
        "641129    2013-09-07           NaN      NaN        NaN          NaN   \n",
        "641130    2013-09-07    2013-09-07        6          1          NaN   \n",
        "641131    2013-09-07    2013-09-07       11          1          NaN   \n",
        "641132    2013-09-07    2013-09-07       29          1          NaN   \n",
        "641133    2013-09-07    2013-09-07       97          1            4   \n",
        "641134    2013-09-07    2013-09-07        1          1          NaN   \n",
        "641135    2013-09-07    2013-09-07        1          1          NaN   \n",
        "641136    2013-09-07    2013-09-07       74          1           14   \n",
        "641137    2013-09-07           NaN      NaN          1          NaN   \n",
        "\n",
        "        nchapters  nforum_posts  roles  incomplete_flag  \n",
        "0             NaN             0    NaN                1  \n",
        "1               1             0    NaN                1  \n",
        "2             NaN             0    NaN                1  \n",
        "3             NaN             0    NaN                1  \n",
        "4             NaN             0    NaN                1  \n",
        "5              12             0    NaN              NaN  \n",
        "6             NaN             0    NaN                1  \n",
        "7               3             0    NaN              NaN  \n",
        "8               3             0    NaN              NaN  \n",
        "9               3             0    NaN                1  \n",
        "10              2             0    NaN              NaN  \n",
        "11              3             0    NaN              NaN  \n",
        "12              7             0    NaN              NaN  \n",
        "13              2             0    NaN                1  \n",
        "14              4             0    NaN              NaN  \n",
        "15              2             0    NaN              NaN  \n",
        "16              1             0    NaN              NaN  \n",
        "17              1             0    NaN                1  \n",
        "18              2             1    NaN              NaN  \n",
        "19              1             0    NaN                1  \n",
        "20              2             0    NaN              NaN  \n",
        "21              1             0    NaN                1  \n",
        "22              1             0    NaN                1  \n",
        "23              2             0    NaN              NaN  \n",
        "24              2             0    NaN              NaN  \n",
        "25            NaN             0    NaN              NaN  \n",
        "26              3             0    NaN                1  \n",
        "27              5             0    NaN              NaN  \n",
        "28              1             0    NaN                1  \n",
        "29              4             0    NaN              NaN  \n",
        "...           ...           ...    ...              ...  \n",
        "641108          3             0    NaN              NaN  \n",
        "641109          2             0    NaN                1  \n",
        "641110          4             0    NaN              NaN  \n",
        "641111          2             0    NaN              NaN  \n",
        "641112        NaN             0    NaN              NaN  \n",
        "641113          1             0    NaN              NaN  \n",
        "641114          1             0    NaN              NaN  \n",
        "641115          3             0    NaN              NaN  \n",
        "641116        NaN             0    NaN              NaN  \n",
        "641117          3             0    NaN              NaN  \n",
        "641118        NaN             0    NaN              NaN  \n",
        "641119          2             0    NaN              NaN  \n",
        "641120          1             0    NaN              NaN  \n",
        "641121          7             0    NaN                1  \n",
        "641122        NaN             0    NaN              NaN  \n",
        "641123        NaN             0    NaN              NaN  \n",
        "641124          2             0    NaN              NaN  \n",
        "641125        NaN             0    NaN              NaN  \n",
        "641126          4             0    NaN              NaN  \n",
        "641127        NaN             0    NaN              NaN  \n",
        "641128          1             0    NaN              NaN  \n",
        "641129        NaN             0    NaN              NaN  \n",
        "641130        NaN             0    NaN              NaN  \n",
        "641131          2             0    NaN              NaN  \n",
        "641132          1             0    NaN              NaN  \n",
        "641133          2             0    NaN              NaN  \n",
        "641134        NaN             0    NaN              NaN  \n",
        "641135        NaN             0    NaN              NaN  \n",
        "641136          1             0    NaN              NaN  \n",
        "641137        NaN             0    NaN                1  \n",
        "\n",
        "[641138 rows x 20 columns]"
       ]
      }
     ],
     "prompt_number": 20
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "df[\"course_id\"] #this evaluates to a Series"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 21,
       "text": [
        "0      HarvardX/CB22x/2013_Spring\n",
        "1             HarvardX/CS50x/2012\n",
        "2      HarvardX/CB22x/2013_Spring\n",
        "3             HarvardX/CS50x/2012\n",
        "4      HarvardX/ER22x/2013_Spring\n",
        "5       HarvardX/PH207x/2012_Fall\n",
        "6     HarvardX/PH278x/2013_Spring\n",
        "7      HarvardX/CB22x/2013_Spring\n",
        "8      HarvardX/CB22x/2013_Spring\n",
        "9             HarvardX/CS50x/2012\n",
        "10     HarvardX/ER22x/2013_Spring\n",
        "11     HarvardX/ER22x/2013_Spring\n",
        "12     HarvardX/CB22x/2013_Spring\n",
        "13            HarvardX/CS50x/2012\n",
        "14     HarvardX/ER22x/2013_Spring\n",
        "...\n",
        "641123     MITx/6.00x/2013_Spring\n",
        "641124     MITx/6.00x/2013_Spring\n",
        "641125    MITx/6.002x/2013_Spring\n",
        "641126     MITx/6.00x/2013_Spring\n",
        "641127    MITx/6.002x/2013_Spring\n",
        "641128    MITx/14.73x/2013_Spring\n",
        "641129     MITx/6.00x/2013_Spring\n",
        "641130    MITx/14.73x/2013_Spring\n",
        "641131     MITx/8.02x/2013_Spring\n",
        "641132    MITx/6.002x/2013_Spring\n",
        "641133     MITx/6.00x/2013_Spring\n",
        "641134     MITx/6.00x/2013_Spring\n",
        "641135    MITx/6.002x/2013_Spring\n",
        "641136     MITx/6.00x/2013_Spring\n",
        "641137     MITx/8.02x/2013_Spring\n",
        "Name: course_id, Length: 641138, dtype: object"
       ]
      }
     ],
     "prompt_number": 21
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "df.ix[100,16] #this picks out a particular value at [row, column]"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 25,
       "text": [
        "nan"
       ]
      }
     ],
     "prompt_number": 25
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "df[\"course_id\"][2240:2250]"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 29,
       "text": [
        "2240           HarvardX/CS50x/2012\n",
        "2241    HarvardX/ER22x/2013_Spring\n",
        "2242     HarvardX/PH207x/2012_Fall\n",
        "2243     HarvardX/PH207x/2012_Fall\n",
        "2244           HarvardX/CS50x/2012\n",
        "2245    HarvardX/CB22x/2013_Spring\n",
        "2246    HarvardX/ER22x/2013_Spring\n",
        "2247           HarvardX/CS50x/2012\n",
        "2248           HarvardX/CS50x/2012\n",
        "2249    HarvardX/CB22x/2013_Spring\n",
        "Name: course_id, dtype: object"
       ]
      }
     ],
     "prompt_number": 29
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "df[2240:2250]"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "html": [
        "<div style=\"max-height:1000px;max-width:1500px;overflow:auto;\">\n",
        "<table border=\"1\" class=\"dataframe\">\n",
        "  <thead>\n",
        "    <tr style=\"text-align: right;\">\n",
        "      <th></th>\n",
        "      <th>course_id</th>\n",
        "      <th>userid_DI</th>\n",
        "      <th>registered</th>\n",
        "      <th>viewed</th>\n",
        "      <th>explored</th>\n",
        "      <th>certified</th>\n",
        "      <th>final_cc_cname_DI</th>\n",
        "      <th>LoE_DI</th>\n",
        "      <th>YoB</th>\n",
        "      <th>gender</th>\n",
        "      <th>grade</th>\n",
        "      <th>start_time_DI</th>\n",
        "      <th>last_event_DI</th>\n",
        "      <th>nevents</th>\n",
        "      <th>ndays_act</th>\n",
        "      <th>nplay_video</th>\n",
        "      <th>nchapters</th>\n",
        "      <th>nforum_posts</th>\n",
        "      <th>roles</th>\n",
        "      <th>incomplete_flag</th>\n",
        "    </tr>\n",
        "  </thead>\n",
        "  <tbody>\n",
        "    <tr>\n",
        "      <th>2240</th>\n",
        "      <td>        HarvardX/CS50x/2012</td>\n",
        "      <td> MHxPC130136599</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>            China</td>\n",
        "      <td> NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>  0.0</td>\n",
        "      <td> 2012-07-26</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>2241</th>\n",
        "      <td> HarvardX/ER22x/2013_Spring</td>\n",
        "      <td> MHxPC130024795</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> Other South Asia</td>\n",
        "      <td> NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-02-06</td>\n",
        "      <td> 2013-03-20</td>\n",
        "      <td>   25</td>\n",
        "      <td>  1</td>\n",
        "      <td> NaN</td>\n",
        "      <td>  2</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>2242</th>\n",
        "      <td>  HarvardX/PH207x/2012_Fall</td>\n",
        "      <td> MHxPC130024795</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> Other South Asia</td>\n",
        "      <td> NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td> 0.91</td>\n",
        "      <td> 2012-10-07</td>\n",
        "      <td> 2013-04-23</td>\n",
        "      <td> 8066</td>\n",
        "      <td> 32</td>\n",
        "      <td> 917</td>\n",
        "      <td> 15</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>2243</th>\n",
        "      <td>  HarvardX/PH207x/2012_Fall</td>\n",
        "      <td> MHxPC130524812</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>     Other Africa</td>\n",
        "      <td> NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2012-08-17</td>\n",
        "      <td> 2012-10-21</td>\n",
        "      <td>  403</td>\n",
        "      <td>  3</td>\n",
        "      <td>  90</td>\n",
        "      <td>  2</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>2244</th>\n",
        "      <td>        HarvardX/CS50x/2012</td>\n",
        "      <td> MHxPC130493694</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>    United States</td>\n",
        "      <td> NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2012-08-17</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>2245</th>\n",
        "      <td> HarvardX/CB22x/2013_Spring</td>\n",
        "      <td> MHxPC130527617</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>          Germany</td>\n",
        "      <td> NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2013-01-22</td>\n",
        "      <td> 2013-03-14</td>\n",
        "      <td>    6</td>\n",
        "      <td>  2</td>\n",
        "      <td> NaN</td>\n",
        "      <td>  1</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>2246</th>\n",
        "      <td> HarvardX/ER22x/2013_Spring</td>\n",
        "      <td> MHxPC130527617</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>          Germany</td>\n",
        "      <td> NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2013-01-22</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td>  2</td>\n",
        "      <td> NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>2247</th>\n",
        "      <td>        HarvardX/CS50x/2012</td>\n",
        "      <td> MHxPC130156189</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>            India</td>\n",
        "      <td> NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2012-08-17</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>2248</th>\n",
        "      <td>        HarvardX/CS50x/2012</td>\n",
        "      <td> MHxPC130593566</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>            India</td>\n",
        "      <td> NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2012-07-25</td>\n",
        "      <td> 2013-05-22</td>\n",
        "      <td>    1</td>\n",
        "      <td>  1</td>\n",
        "      <td> NaN</td>\n",
        "      <td>  3</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>2249</th>\n",
        "      <td> HarvardX/CB22x/2013_Spring</td>\n",
        "      <td> MHxPC130404169</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>           Canada</td>\n",
        "      <td> NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2013-02-14</td>\n",
        "      <td> 2013-03-14</td>\n",
        "      <td>    4</td>\n",
        "      <td>  2</td>\n",
        "      <td> NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "  </tbody>\n",
        "</table>\n",
        "</div>"
       ],
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 30,
       "text": [
        "                       course_id       userid_DI  registered  viewed  \\\n",
        "2240         HarvardX/CS50x/2012  MHxPC130136599           1       0   \n",
        "2241  HarvardX/ER22x/2013_Spring  MHxPC130024795           1       1   \n",
        "2242   HarvardX/PH207x/2012_Fall  MHxPC130024795           1       1   \n",
        "2243   HarvardX/PH207x/2012_Fall  MHxPC130524812           1       1   \n",
        "2244         HarvardX/CS50x/2012  MHxPC130493694           1       0   \n",
        "2245  HarvardX/CB22x/2013_Spring  MHxPC130527617           1       1   \n",
        "2246  HarvardX/ER22x/2013_Spring  MHxPC130527617           1       0   \n",
        "2247         HarvardX/CS50x/2012  MHxPC130156189           1       0   \n",
        "2248         HarvardX/CS50x/2012  MHxPC130593566           1       1   \n",
        "2249  HarvardX/CB22x/2013_Spring  MHxPC130404169           1       0   \n",
        "\n",
        "      explored  certified final_cc_cname_DI LoE_DI  YoB gender grade  \\\n",
        "2240         0          0             China    NaN  NaN    NaN   0.0   \n",
        "2241         0          0  Other South Asia    NaN  NaN    NaN   NaN   \n",
        "2242         1          1  Other South Asia    NaN  NaN    NaN  0.91   \n",
        "2243         0          0      Other Africa    NaN  NaN    NaN     0   \n",
        "2244         0          0     United States    NaN  NaN    NaN     0   \n",
        "2245         0          0           Germany    NaN  NaN    NaN     0   \n",
        "2246         0          0           Germany    NaN  NaN    NaN     0   \n",
        "2247         0          0             India    NaN  NaN    NaN     0   \n",
        "2248         0          0             India    NaN  NaN    NaN     0   \n",
        "2249         0          0            Canada    NaN  NaN    NaN     0   \n",
        "\n",
        "     start_time_DI last_event_DI  nevents  ndays_act  nplay_video  nchapters  \\\n",
        "2240    2012-07-26           NaN      NaN        NaN          NaN        NaN   \n",
        "2241    2013-02-06    2013-03-20       25          1          NaN          2   \n",
        "2242    2012-10-07    2013-04-23     8066         32          917         15   \n",
        "2243    2012-08-17    2012-10-21      403          3           90          2   \n",
        "2244    2012-08-17           NaN      NaN        NaN          NaN        NaN   \n",
        "2245    2013-01-22    2013-03-14        6          2          NaN          1   \n",
        "2246    2013-01-22           NaN      NaN          2          NaN        NaN   \n",
        "2247    2012-08-17           NaN      NaN        NaN          NaN        NaN   \n",
        "2248    2012-07-25    2013-05-22        1          1          NaN          3   \n",
        "2249    2013-02-14    2013-03-14        4          2          NaN        NaN   \n",
        "\n",
        "      nforum_posts  roles  incomplete_flag  \n",
        "2240             0    NaN              NaN  \n",
        "2241             0    NaN              NaN  \n",
        "2242             0    NaN              NaN  \n",
        "2243             0    NaN              NaN  \n",
        "2244             0    NaN              NaN  \n",
        "2245             0    NaN              NaN  \n",
        "2246             0    NaN                1  \n",
        "2247             0    NaN              NaN  \n",
        "2248             0    NaN              NaN  \n",
        "2249             0    NaN              NaN  "
       ]
      }
     ],
     "prompt_number": 30
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "df[666] #error on purpose!"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "ename": "KeyError",
       "evalue": "666",
       "output_type": "pyerr",
       "traceback": [
        "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m\n\u001b[0;31mKeyError\u001b[0m                                  Traceback (most recent call last)",
        "\u001b[0;32m<ipython-input-31-342ddc6d1cab>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m()\u001b[0m\n\u001b[0;32m----> 1\u001b[0;31m \u001b[0mdf\u001b[0m\u001b[0;34m[\u001b[0m\u001b[0;36m666\u001b[0m\u001b[0;34m]\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
        "\u001b[0;32m/usr/local/lib/python2.7/dist-packages/pandas/core/frame.pyc\u001b[0m in \u001b[0;36m__getitem__\u001b[0;34m(self, key)\u001b[0m\n\u001b[1;32m   1682\u001b[0m             \u001b[0;32mreturn\u001b[0m \u001b[0mself\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0m_getitem_multilevel\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mkey\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m   1683\u001b[0m         \u001b[0;32melse\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m-> 1684\u001b[0;31m             \u001b[0;32mreturn\u001b[0m \u001b[0mself\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0m_getitem_column\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mkey\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m   1685\u001b[0m \u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m   1686\u001b[0m     \u001b[0;32mdef\u001b[0m \u001b[0m_getitem_column\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mself\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0mkey\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
        "\u001b[0;32m/usr/local/lib/python2.7/dist-packages/pandas/core/frame.pyc\u001b[0m in \u001b[0;36m_getitem_column\u001b[0;34m(self, key)\u001b[0m\n\u001b[1;32m   1689\u001b[0m         \u001b[0;31m# get column\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m   1690\u001b[0m         \u001b[0;32mif\u001b[0m \u001b[0mself\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mcolumns\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mis_unique\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m-> 1691\u001b[0;31m             \u001b[0;32mreturn\u001b[0m \u001b[0mself\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0m_get_item_cache\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mkey\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m   1692\u001b[0m \u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m   1693\u001b[0m         \u001b[0;31m# duplicate columns & possible reduce dimensionaility\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
        "\u001b[0;32m/usr/local/lib/python2.7/dist-packages/pandas/core/generic.pyc\u001b[0m in \u001b[0;36m_get_item_cache\u001b[0;34m(self, item)\u001b[0m\n\u001b[1;32m   1050\u001b[0m         \u001b[0mres\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0mcache\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mget\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mitem\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m   1051\u001b[0m         \u001b[0;32mif\u001b[0m \u001b[0mres\u001b[0m \u001b[0;32mis\u001b[0m \u001b[0mNone\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m-> 1052\u001b[0;31m             \u001b[0mvalues\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0mself\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0m_data\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mget\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mitem\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m   1053\u001b[0m             \u001b[0mres\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0mself\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0m_box_item_values\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mitem\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0mvalues\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m   1054\u001b[0m             \u001b[0mcache\u001b[0m\u001b[0;34m[\u001b[0m\u001b[0mitem\u001b[0m\u001b[0;34m]\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0mres\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
        "\u001b[0;32m/usr/local/lib/python2.7/dist-packages/pandas/core/internals.pyc\u001b[0m in \u001b[0;36mget\u001b[0;34m(self, item)\u001b[0m\n\u001b[1;32m   2535\u001b[0m \u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m   2536\u001b[0m             \u001b[0;32mif\u001b[0m \u001b[0;32mnot\u001b[0m \u001b[0misnull\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mitem\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m-> 2537\u001b[0;31m                 \u001b[0mloc\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0mself\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mitems\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mget_loc\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mitem\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m   2538\u001b[0m             \u001b[0;32melse\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m   2539\u001b[0m                 \u001b[0mindexer\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0mnp\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0marange\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mlen\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mself\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mitems\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m[\u001b[0m\u001b[0misnull\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mself\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mitems\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m]\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
        "\u001b[0;32m/usr/local/lib/python2.7/dist-packages/pandas/core/index.pyc\u001b[0m in \u001b[0;36mget_loc\u001b[0;34m(self, key)\u001b[0m\n\u001b[1;32m   1154\u001b[0m         \u001b[0mloc\u001b[0m \u001b[0;34m:\u001b[0m \u001b[0mint\u001b[0m \u001b[0;32mif\u001b[0m \u001b[0munique\u001b[0m \u001b[0mindex\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0mpossibly\u001b[0m \u001b[0mslice\u001b[0m \u001b[0;32mor\u001b[0m \u001b[0mmask\u001b[0m \u001b[0;32mif\u001b[0m \u001b[0;32mnot\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m   1155\u001b[0m         \"\"\"\n\u001b[0;32m-> 1156\u001b[0;31m         \u001b[0;32mreturn\u001b[0m \u001b[0mself\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0m_engine\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mget_loc\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0m_values_from_object\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mkey\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m   1157\u001b[0m \u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m   1158\u001b[0m     \u001b[0;32mdef\u001b[0m \u001b[0mget_value\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mself\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0mseries\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0mkey\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
        "\u001b[0;32m/usr/local/lib/python2.7/dist-packages/pandas/index.so\u001b[0m in \u001b[0;36mpandas.index.IndexEngine.get_loc (pandas/index.c:3353)\u001b[0;34m()\u001b[0m\n",
        "\u001b[0;32m/usr/local/lib/python2.7/dist-packages/pandas/index.so\u001b[0m in \u001b[0;36mpandas.index.IndexEngine.get_loc (pandas/index.c:3233)\u001b[0;34m()\u001b[0m\n",
        "\u001b[0;32m/usr/local/lib/python2.7/dist-packages/pandas/hashtable.so\u001b[0m in \u001b[0;36mpandas.hashtable.PyObjectHashTable.get_item (pandas/hashtable.c:11148)\u001b[0;34m()\u001b[0m\n",
        "\u001b[0;32m/usr/local/lib/python2.7/dist-packages/pandas/hashtable.so\u001b[0m in \u001b[0;36mpandas.hashtable.PyObjectHashTable.get_item (pandas/hashtable.c:11101)\u001b[0;34m()\u001b[0m\n",
        "\u001b[0;31mKeyError\u001b[0m: 666"
       ]
      }
     ],
     "prompt_number": 31
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "df.ix[666] #evaluates to series"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 37,
       "text": [
        "course_id            HarvardX/CS50x/2012\n",
        "userid_DI                 MHxPC130297337\n",
        "registered                             1\n",
        "viewed                                 0\n",
        "explored                               0\n",
        "certified                              0\n",
        "final_cc_cname_DI         United Kingdom\n",
        "LoE_DI                               NaN\n",
        "YoB                                  NaN\n",
        "gender                               NaN\n",
        "grade                                  0\n",
        "start_time_DI                 2012-08-17\n",
        "last_event_DI                        NaN\n",
        "nevents                              NaN\n",
        "ndays_act                            NaN\n",
        "nplay_video                          NaN\n",
        "nchapters                            NaN\n",
        "nforum_posts                           0\n",
        "roles                                NaN\n",
        "incomplete_flag                      NaN\n",
        "Name: 666, dtype: object"
       ]
      }
     ],
     "prompt_number": 37
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "df.ix[[666]] #evaluates to data frame"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "html": [
        "<div style=\"max-height:1000px;max-width:1500px;overflow:auto;\">\n",
        "<table border=\"1\" class=\"dataframe\">\n",
        "  <thead>\n",
        "    <tr style=\"text-align: right;\">\n",
        "      <th></th>\n",
        "      <th>course_id</th>\n",
        "      <th>userid_DI</th>\n",
        "      <th>registered</th>\n",
        "      <th>viewed</th>\n",
        "      <th>explored</th>\n",
        "      <th>certified</th>\n",
        "      <th>final_cc_cname_DI</th>\n",
        "      <th>LoE_DI</th>\n",
        "      <th>YoB</th>\n",
        "      <th>gender</th>\n",
        "      <th>grade</th>\n",
        "      <th>start_time_DI</th>\n",
        "      <th>last_event_DI</th>\n",
        "      <th>nevents</th>\n",
        "      <th>ndays_act</th>\n",
        "      <th>nplay_video</th>\n",
        "      <th>nchapters</th>\n",
        "      <th>nforum_posts</th>\n",
        "      <th>roles</th>\n",
        "      <th>incomplete_flag</th>\n",
        "    </tr>\n",
        "  </thead>\n",
        "  <tbody>\n",
        "    <tr>\n",
        "      <th>666</th>\n",
        "      <td> HarvardX/CS50x/2012</td>\n",
        "      <td> MHxPC130297337</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> United Kingdom</td>\n",
        "      <td> NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td> 0</td>\n",
        "      <td> 2012-08-17</td>\n",
        "      <td> NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
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       "output_type": "pyout",
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        "dtype: float64"
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     "cell_type": "code",
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    {
     "cell_type": "code",
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        "      <td>         HarvardX/CS50x/2012</td>\n",
        "      <td> MHxPC130024894</td>\n",
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        "      <td> 0</td>\n",
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        "      <td>      United States</td>\n",
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        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
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        "      <td> 2012-12-19</td>\n",
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        "      <td>      United States</td>\n",
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        "      <td>    0</td>\n",
        "      <td> 2012-07-26</td>\n",
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        "      <td>NaN</td>\n",
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        "      <td> HarvardX/PH278x/2013_Spring</td>\n",
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        "      <td>  NaN</td>\n",
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        "      <td>    0</td>\n",
        "      <td> 2013-07-30</td>\n",
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        "      <td>NaN</td>\n",
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        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
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        "      <td> 0</td>\n",
        "      <td>      United States</td>\n",
        "      <td>                 NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2012-10-15</td>\n",
        "      <td>        NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td> 11</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>18    </th>\n",
        "      <td>   HarvardX/PH207x/2012_Fall</td>\n",
        "      <td> MHxPC130080986</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>      United States</td>\n",
        "      <td>                 NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2012-10-25</td>\n",
        "      <td> 2012-12-04</td>\n",
        "      <td>  56</td>\n",
        "      <td> 11</td>\n",
        "      <td>  1</td>\n",
        "      <td>  2</td>\n",
        "      <td> 1</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>19    </th>\n",
        "      <td>         HarvardX/CS50x/2012</td>\n",
        "      <td> MHxPC130063375</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>      Unknown/Other</td>\n",
        "      <td>                 NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2012-10-19</td>\n",
        "      <td>        NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>20    </th>\n",
        "      <td>         HarvardX/CS50x/2012</td>\n",
        "      <td> MHxPC130094371</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>      United States</td>\n",
        "      <td>                 NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2013-03-03</td>\n",
        "      <td> 2013-03-03</td>\n",
        "      <td>   7</td>\n",
        "      <td>  1</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  2</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>21    </th>\n",
        "      <td>         HarvardX/CS50x/2012</td>\n",
        "      <td> MHxPC130229084</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>             Mexico</td>\n",
        "      <td>                 NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2012-10-15</td>\n",
        "      <td>        NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>22    </th>\n",
        "      <td>         HarvardX/CS50x/2012</td>\n",
        "      <td> MHxPC130300925</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>      United States</td>\n",
        "      <td>                 NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2012-10-24</td>\n",
        "      <td>        NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>  2</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>23    </th>\n",
        "      <td>  HarvardX/ER22x/2013_Spring</td>\n",
        "      <td> MHxPC130300925</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>      United States</td>\n",
        "      <td>                 NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2012-12-20</td>\n",
        "      <td> 2013-05-18</td>\n",
        "      <td>  15</td>\n",
        "      <td>  2</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  2</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>24    </th>\n",
        "      <td>         HarvardX/CS50x/2012</td>\n",
        "      <td> MHxPC130417650</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>          Australia</td>\n",
        "      <td>                 NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2012-10-29</td>\n",
        "      <td> 2013-03-04</td>\n",
        "      <td>   1</td>\n",
        "      <td>  1</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  2</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>26    </th>\n",
        "      <td>         HarvardX/CS50x/2012</td>\n",
        "      <td> MHxPC130298257</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>      United States</td>\n",
        "      <td>                 NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2012-09-05</td>\n",
        "      <td>        NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  3</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>27    </th>\n",
        "      <td>         HarvardX/CS50x/2012</td>\n",
        "      <td> MHxPC130500569</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>      United States</td>\n",
        "      <td>                 NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2012-10-22</td>\n",
        "      <td> 2013-03-30</td>\n",
        "      <td>   6</td>\n",
        "      <td>  1</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  5</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>28    </th>\n",
        "      <td>         HarvardX/CS50x/2012</td>\n",
        "      <td> MHxPC130466479</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>      Unknown/Other</td>\n",
        "      <td>                 NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2013-01-07</td>\n",
        "      <td>        NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>29    </th>\n",
        "      <td>  HarvardX/CB22x/2013_Spring</td>\n",
        "      <td> MHxPC130340959</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>      United States</td>\n",
        "      <td>                 NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td> 0.05</td>\n",
        "      <td> 2013-02-11</td>\n",
        "      <td> 2013-04-06</td>\n",
        "      <td> 285</td>\n",
        "      <td>  8</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  4</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>33    </th>\n",
        "      <td>         HarvardX/CS50x/2012</td>\n",
        "      <td> MHxPC130356280</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>              India</td>\n",
        "      <td>                 NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2012-09-27</td>\n",
        "      <td> 2013-03-31</td>\n",
        "      <td>   3</td>\n",
        "      <td>  1</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>34    </th>\n",
        "      <td>         HarvardX/CS50x/2012</td>\n",
        "      <td> MHxPC130328890</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>          Australia</td>\n",
        "      <td>                 NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2012-12-10</td>\n",
        "      <td> 2013-02-27</td>\n",
        "      <td>   2</td>\n",
        "      <td>  1</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  5</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>36    </th>\n",
        "      <td>  HarvardX/CB22x/2013_Spring</td>\n",
        "      <td> MHxPC130435030</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>             Canada</td>\n",
        "      <td>                 NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2013-02-20</td>\n",
        "      <td> 2013-06-29</td>\n",
        "      <td>  80</td>\n",
        "      <td>  5</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  2</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>37    </th>\n",
        "      <td>         HarvardX/CS50x/2012</td>\n",
        "      <td> MHxPC130435030</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>             Canada</td>\n",
        "      <td>                 NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2012-10-13</td>\n",
        "      <td>        NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>  1</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>41    </th>\n",
        "      <td>  HarvardX/CB22x/2013_Spring</td>\n",
        "      <td> MHxPC130542822</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>      United States</td>\n",
        "      <td>                 NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2012-12-20</td>\n",
        "      <td> 2013-03-14</td>\n",
        "      <td>  21</td>\n",
        "      <td>  3</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>43    </th>\n",
        "      <td>  HarvardX/ER22x/2013_Spring</td>\n",
        "      <td> MHxPC130069044</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>      United States</td>\n",
        "      <td>                 NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2013-04-22</td>\n",
        "      <td> 2013-04-23</td>\n",
        "      <td>   1</td>\n",
        "      <td>  1</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  2</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>...</th>\n",
        "      <td>...</td>\n",
        "      <td>...</td>\n",
        "      <td>...</td>\n",
        "      <td>...</td>\n",
        "      <td>...</td>\n",
        "      <td>...</td>\n",
        "      <td>...</td>\n",
        "      <td>...</td>\n",
        "      <td>...</td>\n",
        "      <td>...</td>\n",
        "      <td>...</td>\n",
        "      <td>...</td>\n",
        "      <td>...</td>\n",
        "      <td>...</td>\n",
        "      <td>...</td>\n",
        "      <td>...</td>\n",
        "      <td>...</td>\n",
        "      <td>...</td>\n",
        "      <td>...</td>\n",
        "      <td>...</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641083</th>\n",
        "      <td>      MITx/6.00x/2013_Spring</td>\n",
        "      <td> MHxPC130238153</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>      United States</td>\n",
        "      <td>           Secondary</td>\n",
        "      <td> 1988</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 116</td>\n",
        "      <td>  1</td>\n",
        "      <td> 20</td>\n",
        "      <td>  2</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641084</th>\n",
        "      <td>     MITx/6.002x/2013_Spring</td>\n",
        "      <td> MHxPC130544641</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>              India</td>\n",
        "      <td>          Bachelor's</td>\n",
        "      <td> 1992</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 245</td>\n",
        "      <td>  1</td>\n",
        "      <td> 56</td>\n",
        "      <td>  1</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641085</th>\n",
        "      <td>      MITx/8.02x/2013_Spring</td>\n",
        "      <td> MHxPC130117789</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>              India</td>\n",
        "      <td> Less than Secondary</td>\n",
        "      <td> 1996</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 169</td>\n",
        "      <td>  1</td>\n",
        "      <td> 45</td>\n",
        "      <td>  3</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641086</th>\n",
        "      <td>     MITx/14.73x/2013_Spring</td>\n",
        "      <td> MHxPC130122763</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>              India</td>\n",
        "      <td>            Master's</td>\n",
        "      <td> 1987</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td>   3</td>\n",
        "      <td>  1</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641088</th>\n",
        "      <td>      MITx/6.00x/2013_Spring</td>\n",
        "      <td> MHxPC130214187</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>              India</td>\n",
        "      <td>          Bachelor's</td>\n",
        "      <td> 1984</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td>   1</td>\n",
        "      <td>  1</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  3</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641089</th>\n",
        "      <td>     MITx/6.002x/2013_Spring</td>\n",
        "      <td> MHxPC130145710</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>              India</td>\n",
        "      <td>          Bachelor's</td>\n",
        "      <td> 1989</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td>  82</td>\n",
        "      <td>  1</td>\n",
        "      <td> 16</td>\n",
        "      <td>  5</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641099</th>\n",
        "      <td>      MITx/6.00x/2013_Spring</td>\n",
        "      <td> MHxPC130455967</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>      United States</td>\n",
        "      <td>          Bachelor's</td>\n",
        "      <td> 1988</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 242</td>\n",
        "      <td>  1</td>\n",
        "      <td> 22</td>\n",
        "      <td>  5</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641100</th>\n",
        "      <td>     MITx/6.002x/2013_Spring</td>\n",
        "      <td> MHxPC130040345</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>              India</td>\n",
        "      <td>           Secondary</td>\n",
        "      <td> 1993</td>\n",
        "      <td>   f</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td>  94</td>\n",
        "      <td>  1</td>\n",
        "      <td>  7</td>\n",
        "      <td>  2</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641101</th>\n",
        "      <td>      MITx/6.00x/2013_Spring</td>\n",
        "      <td> MHxPC130298117</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> Russian Federation</td>\n",
        "      <td> Less than Secondary</td>\n",
        "      <td> 1997</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td>        NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641102</th>\n",
        "      <td>      MITx/6.00x/2013_Spring</td>\n",
        "      <td> MHxPC130024301</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>            Morocco</td>\n",
        "      <td>           Secondary</td>\n",
        "      <td> 1994</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td>  25</td>\n",
        "      <td>  1</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  2</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641103</th>\n",
        "      <td>      MITx/6.00x/2013_Spring</td>\n",
        "      <td> MHxPC130097716</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>              India</td>\n",
        "      <td>          Bachelor's</td>\n",
        "      <td> 1981</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td>  11</td>\n",
        "      <td>  1</td>\n",
        "      <td>  2</td>\n",
        "      <td>  2</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641107</th>\n",
        "      <td>      MITx/8.02x/2013_Spring</td>\n",
        "      <td> MHxPC130347356</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>              India</td>\n",
        "      <td>           Secondary</td>\n",
        "      <td> 1994</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 153</td>\n",
        "      <td>  1</td>\n",
        "      <td> 31</td>\n",
        "      <td>  2</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641108</th>\n",
        "      <td>     MITx/6.002x/2013_Spring</td>\n",
        "      <td> MHxPC130140735</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>      United States</td>\n",
        "      <td>          Bachelor's</td>\n",
        "      <td> 1991</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td>  59</td>\n",
        "      <td>  1</td>\n",
        "      <td>  5</td>\n",
        "      <td>  3</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641109</th>\n",
        "      <td>      MITx/6.00x/2013_Spring</td>\n",
        "      <td> MHxPC130493130</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>     United Kingdom</td>\n",
        "      <td>            Master's</td>\n",
        "      <td> 1977</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td>        NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  2</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641110</th>\n",
        "      <td>      MITx/6.00x/2013_Spring</td>\n",
        "      <td> MHxPC130400592</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>       Other Europe</td>\n",
        "      <td>           Secondary</td>\n",
        "      <td> 1992</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 395</td>\n",
        "      <td>  1</td>\n",
        "      <td> 51</td>\n",
        "      <td>  4</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641111</th>\n",
        "      <td>      MITx/6.00x/2013_Spring</td>\n",
        "      <td> MHxPC130109892</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>              India</td>\n",
        "      <td>           Secondary</td>\n",
        "      <td> 1995</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td>  49</td>\n",
        "      <td>  1</td>\n",
        "      <td> 14</td>\n",
        "      <td>  2</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641113</th>\n",
        "      <td>     MITx/8.MReV/2013_Summer</td>\n",
        "      <td> MHxPC130261281</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>              India</td>\n",
        "      <td>           Secondary</td>\n",
        "      <td> 1994</td>\n",
        "      <td>   m</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td>   8</td>\n",
        "      <td>  1</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641114</th>\n",
        "      <td>      MITx/6.00x/2013_Spring</td>\n",
        "      <td> MHxPC130481990</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>              India</td>\n",
        "      <td>          Bachelor's</td>\n",
        "      <td> 1989</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td>  22</td>\n",
        "      <td>  1</td>\n",
        "      <td>  5</td>\n",
        "      <td>  1</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641115</th>\n",
        "      <td>      MITx/6.00x/2013_Spring</td>\n",
        "      <td> MHxPC130528581</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>      United States</td>\n",
        "      <td>          Bachelor's</td>\n",
        "      <td> 1990</td>\n",
        "      <td>   f</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td>   2</td>\n",
        "      <td>  1</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  3</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641117</th>\n",
        "      <td>     MITx/6.002x/2013_Spring</td>\n",
        "      <td> MHxPC130408810</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>              India</td>\n",
        "      <td>           Secondary</td>\n",
        "      <td> 1993</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td>   2</td>\n",
        "      <td>  1</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  3</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641119</th>\n",
        "      <td>     MITx/6.002x/2013_Spring</td>\n",
        "      <td> MHxPC130566049</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>       Other Europe</td>\n",
        "      <td>            Master's</td>\n",
        "      <td> 1982</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td>   2</td>\n",
        "      <td>  1</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  2</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641120</th>\n",
        "      <td>     MITx/8.MReV/2013_Summer</td>\n",
        "      <td> MHxPC130374105</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>              India</td>\n",
        "      <td>          Bachelor's</td>\n",
        "      <td> 1992</td>\n",
        "      <td>   m</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td>  49</td>\n",
        "      <td>  1</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641121</th>\n",
        "      <td>      MITx/6.00x/2013_Spring</td>\n",
        "      <td> MHxPC130282999</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>       Other Europe</td>\n",
        "      <td>            Master's</td>\n",
        "      <td> 1979</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td>        NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  7</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641124</th>\n",
        "      <td>      MITx/6.00x/2013_Spring</td>\n",
        "      <td> MHxPC130505931</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>              India</td>\n",
        "      <td>           Secondary</td>\n",
        "      <td> 1995</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td>  59</td>\n",
        "      <td>  1</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  2</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641126</th>\n",
        "      <td>      MITx/6.00x/2013_Spring</td>\n",
        "      <td> MHxPC130137331</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>      United States</td>\n",
        "      <td>           Secondary</td>\n",
        "      <td> 1992</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 251</td>\n",
        "      <td>  1</td>\n",
        "      <td> 77</td>\n",
        "      <td>  4</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641128</th>\n",
        "      <td>     MITx/14.73x/2013_Spring</td>\n",
        "      <td> MHxPC130256541</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>      United States</td>\n",
        "      <td>            Master's</td>\n",
        "      <td> 1982</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td>  51</td>\n",
        "      <td>  1</td>\n",
        "      <td>  1</td>\n",
        "      <td>  1</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641131</th>\n",
        "      <td>      MITx/8.02x/2013_Spring</td>\n",
        "      <td> MHxPC130226305</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>      Unknown/Other</td>\n",
        "      <td>          Bachelor's</td>\n",
        "      <td> 1988</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td>  11</td>\n",
        "      <td>  1</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  2</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641132</th>\n",
        "      <td>     MITx/6.002x/2013_Spring</td>\n",
        "      <td> MHxPC130030805</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>           Pakistan</td>\n",
        "      <td>            Master's</td>\n",
        "      <td> 1989</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td>  29</td>\n",
        "      <td>  1</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641133</th>\n",
        "      <td>      MITx/6.00x/2013_Spring</td>\n",
        "      <td> MHxPC130184108</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>             Canada</td>\n",
        "      <td>          Bachelor's</td>\n",
        "      <td> 1991</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td>  97</td>\n",
        "      <td>  1</td>\n",
        "      <td>  4</td>\n",
        "      <td>  2</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>641136</th>\n",
        "      <td>      MITx/6.00x/2013_Spring</td>\n",
        "      <td> MHxPC130098513</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td>      United States</td>\n",
        "      <td>           Doctorate</td>\n",
        "      <td> 1979</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td>  74</td>\n",
        "      <td>  1</td>\n",
        "      <td> 14</td>\n",
        "      <td>  1</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "  </tbody>\n",
        "</table>\n",
        "<p>382385 rows \u00d7 20 columns</p>\n",
        "</div>"
       ],
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 64,
       "text": [
        "                          course_id       userid_DI  registered  viewed  \\\n",
        "1               HarvardX/CS50x/2012  MHxPC130442623           1       1   \n",
        "5         HarvardX/PH207x/2012_Fall  MHxPC130275857           1       1   \n",
        "7        HarvardX/CB22x/2013_Spring  MHxPC130539455           1       1   \n",
        "8        HarvardX/CB22x/2013_Spring  MHxPC130088379           1       1   \n",
        "9               HarvardX/CS50x/2012  MHxPC130088379           1       1   \n",
        "10       HarvardX/ER22x/2013_Spring  MHxPC130088379           1       1   \n",
        "11       HarvardX/ER22x/2013_Spring  MHxPC130198098           1       1   \n",
        "12       HarvardX/CB22x/2013_Spring  MHxPC130024894           1       1   \n",
        "13              HarvardX/CS50x/2012  MHxPC130024894           1       1   \n",
        "14       HarvardX/ER22x/2013_Spring  MHxPC130024894           1       1   \n",
        "15        HarvardX/PH207x/2012_Fall  MHxPC130024894           1       1   \n",
        "16      HarvardX/PH278x/2013_Spring  MHxPC130024894           1       1   \n",
        "17              HarvardX/CS50x/2012  MHxPC130080986           1       1   \n",
        "18        HarvardX/PH207x/2012_Fall  MHxPC130080986           1       1   \n",
        "19              HarvardX/CS50x/2012  MHxPC130063375           1       1   \n",
        "20              HarvardX/CS50x/2012  MHxPC130094371           1       1   \n",
        "21              HarvardX/CS50x/2012  MHxPC130229084           1       1   \n",
        "22              HarvardX/CS50x/2012  MHxPC130300925           1       1   \n",
        "23       HarvardX/ER22x/2013_Spring  MHxPC130300925           1       1   \n",
        "24              HarvardX/CS50x/2012  MHxPC130417650           1       1   \n",
        "26              HarvardX/CS50x/2012  MHxPC130298257           1       0   \n",
        "27              HarvardX/CS50x/2012  MHxPC130500569           1       1   \n",
        "28              HarvardX/CS50x/2012  MHxPC130466479           1       1   \n",
        "29       HarvardX/CB22x/2013_Spring  MHxPC130340959           1       1   \n",
        "33              HarvardX/CS50x/2012  MHxPC130356280           1       1   \n",
        "34              HarvardX/CS50x/2012  MHxPC130328890           1       1   \n",
        "36       HarvardX/CB22x/2013_Spring  MHxPC130435030           1       1   \n",
        "37              HarvardX/CS50x/2012  MHxPC130435030           1       1   \n",
        "41       HarvardX/CB22x/2013_Spring  MHxPC130542822           1       1   \n",
        "43       HarvardX/ER22x/2013_Spring  MHxPC130069044           1       0   \n",
        "...                             ...             ...         ...     ...   \n",
        "641083       MITx/6.00x/2013_Spring  MHxPC130238153           1       1   \n",
        "641084      MITx/6.002x/2013_Spring  MHxPC130544641           1       1   \n",
        "641085       MITx/8.02x/2013_Spring  MHxPC130117789           1       1   \n",
        "641086      MITx/14.73x/2013_Spring  MHxPC130122763           1       1   \n",
        "641088       MITx/6.00x/2013_Spring  MHxPC130214187           1       0   \n",
        "641089      MITx/6.002x/2013_Spring  MHxPC130145710           1       1   \n",
        "641099       MITx/6.00x/2013_Spring  MHxPC130455967           1       1   \n",
        "641100      MITx/6.002x/2013_Spring  MHxPC130040345           1       1   \n",
        "641101       MITx/6.00x/2013_Spring  MHxPC130298117           1       0   \n",
        "641102       MITx/6.00x/2013_Spring  MHxPC130024301           1       1   \n",
        "641103       MITx/6.00x/2013_Spring  MHxPC130097716           1       1   \n",
        "641107       MITx/8.02x/2013_Spring  MHxPC130347356           1       1   \n",
        "641108      MITx/6.002x/2013_Spring  MHxPC130140735           1       1   \n",
        "641109       MITx/6.00x/2013_Spring  MHxPC130493130           1       0   \n",
        "641110       MITx/6.00x/2013_Spring  MHxPC130400592           1       1   \n",
        "641111       MITx/6.00x/2013_Spring  MHxPC130109892           1       1   \n",
        "641113      MITx/8.MReV/2013_Summer  MHxPC130261281           1       1   \n",
        "641114       MITx/6.00x/2013_Spring  MHxPC130481990           1       1   \n",
        "641115       MITx/6.00x/2013_Spring  MHxPC130528581           1       0   \n",
        "641117      MITx/6.002x/2013_Spring  MHxPC130408810           1       0   \n",
        "641119      MITx/6.002x/2013_Spring  MHxPC130566049           1       0   \n",
        "641120      MITx/8.MReV/2013_Summer  MHxPC130374105           1       1   \n",
        "641121       MITx/6.00x/2013_Spring  MHxPC130282999           1       0   \n",
        "641124       MITx/6.00x/2013_Spring  MHxPC130505931           1       1   \n",
        "641126       MITx/6.00x/2013_Spring  MHxPC130137331           1       1   \n",
        "641128      MITx/14.73x/2013_Spring  MHxPC130256541           1       1   \n",
        "641131       MITx/8.02x/2013_Spring  MHxPC130226305           1       0   \n",
        "641132      MITx/6.002x/2013_Spring  MHxPC130030805           1       1   \n",
        "641133       MITx/6.00x/2013_Spring  MHxPC130184108           1       1   \n",
        "641136       MITx/6.00x/2013_Spring  MHxPC130098513           1       1   \n",
        "\n",
        "        explored  certified   final_cc_cname_DI               LoE_DI   YoB  \\\n",
        "1              0          0       United States                  NaN   NaN   \n",
        "5              1          0       United States                  NaN   NaN   \n",
        "7              0          0              France                  NaN   NaN   \n",
        "8              0          0       United States                  NaN   NaN   \n",
        "9              0          0       United States                  NaN   NaN   \n",
        "10             0          0       United States                  NaN   NaN   \n",
        "11             0          0       United States                  NaN   NaN   \n",
        "12             0          0       United States                  NaN   NaN   \n",
        "13             0          0       United States                  NaN   NaN   \n",
        "14             0          0       United States                  NaN   NaN   \n",
        "15             0          0       United States                  NaN   NaN   \n",
        "16             0          0       United States                  NaN   NaN   \n",
        "17             0          0       United States                  NaN   NaN   \n",
        "18             0          0       United States                  NaN   NaN   \n",
        "19             0          0       Unknown/Other                  NaN   NaN   \n",
        "20             0          0       United States                  NaN   NaN   \n",
        "21             0          0              Mexico                  NaN   NaN   \n",
        "22             0          0       United States                  NaN   NaN   \n",
        "23             0          0       United States                  NaN   NaN   \n",
        "24             0          0           Australia                  NaN   NaN   \n",
        "26             0          0       United States                  NaN   NaN   \n",
        "27             0          0       United States                  NaN   NaN   \n",
        "28             0          0       Unknown/Other                  NaN   NaN   \n",
        "29             0          0       United States                  NaN   NaN   \n",
        "33             0          0               India                  NaN   NaN   \n",
        "34             0          0           Australia                  NaN   NaN   \n",
        "36             0          0              Canada                  NaN   NaN   \n",
        "37             0          0              Canada                  NaN   NaN   \n",
        "41             0          0       United States                  NaN   NaN   \n",
        "43             0          0       United States                  NaN   NaN   \n",
        "...          ...        ...                 ...                  ...   ...   \n",
        "641083         0          0       United States            Secondary  1988   \n",
        "641084         0          0               India           Bachelor's  1992   \n",
        "641085         0          0               India  Less than Secondary  1996   \n",
        "641086         0          0               India             Master's  1987   \n",
        "641088         0          0               India           Bachelor's  1984   \n",
        "641089         0          0               India           Bachelor's  1989   \n",
        "641099         0          0       United States           Bachelor's  1988   \n",
        "641100         0          0               India            Secondary  1993   \n",
        "641101         0          0  Russian Federation  Less than Secondary  1997   \n",
        "641102         0          0             Morocco            Secondary  1994   \n",
        "641103         0          0               India           Bachelor's  1981   \n",
        "641107         0          0               India            Secondary  1994   \n",
        "641108         0          0       United States           Bachelor's  1991   \n",
        "641109         0          0      United Kingdom             Master's  1977   \n",
        "641110         0          0        Other Europe            Secondary  1992   \n",
        "641111         0          0               India            Secondary  1995   \n",
        "641113         0          0               India            Secondary  1994   \n",
        "641114         0          0               India           Bachelor's  1989   \n",
        "641115         0          0       United States           Bachelor's  1990   \n",
        "641117         0          0               India            Secondary  1993   \n",
        "641119         0          0        Other Europe             Master's  1982   \n",
        "641120         0          0               India           Bachelor's  1992   \n",
        "641121         0          0        Other Europe             Master's  1979   \n",
        "641124         0          0               India            Secondary  1995   \n",
        "641126         0          0       United States            Secondary  1992   \n",
        "641128         0          0       United States             Master's  1982   \n",
        "641131         0          0       Unknown/Other           Bachelor's  1988   \n",
        "641132         0          0            Pakistan             Master's  1989   \n",
        "641133         0          0              Canada           Bachelor's  1991   \n",
        "641136         0          0       United States            Doctorate  1979   \n",
        "\n",
        "       gender grade start_time_DI last_event_DI  nevents  ndays_act  \\\n",
        "1         NaN     0    2012-10-15           NaN      NaN          9   \n",
        "5         NaN     0    2012-09-17    2013-05-23      502         16   \n",
        "7         NaN     0    2013-01-01    2013-05-14       42          6   \n",
        "8         NaN     0    2013-02-18    2013-03-17       70          3   \n",
        "9         NaN     0    2012-10-20           NaN      NaN         12   \n",
        "10        NaN     0    2013-02-23    2013-06-14       17          2   \n",
        "11        NaN     0    2013-06-17    2013-06-17       32          1   \n",
        "12        NaN  0.07    2013-01-24    2013-08-03      175          9   \n",
        "13        NaN     0    2013-06-27           NaN      NaN          2   \n",
        "14        NaN     0    2012-12-19    2013-08-17       78          5   \n",
        "15        NaN     0    2012-07-26    2013-01-16       75         14   \n",
        "16        NaN     0    2013-07-30    2013-08-27       11          2   \n",
        "17        NaN     0    2012-10-15           NaN      NaN         11   \n",
        "18        NaN     0    2012-10-25    2012-12-04       56         11   \n",
        "19        NaN     0    2012-10-19           NaN      NaN        NaN   \n",
        "20        NaN     0    2013-03-03    2013-03-03        7          1   \n",
        "21        NaN     0    2012-10-15           NaN      NaN        NaN   \n",
        "22        NaN     0    2012-10-24           NaN      NaN          2   \n",
        "23        NaN     0    2012-12-20    2013-05-18       15          2   \n",
        "24        NaN     0    2012-10-29    2013-03-04        1          1   \n",
        "26        NaN     0    2012-09-05           NaN      NaN        NaN   \n",
        "27        NaN     0    2012-10-22    2013-03-30        6          1   \n",
        "28        NaN     0    2013-01-07           NaN      NaN        NaN   \n",
        "29        NaN  0.05    2013-02-11    2013-04-06      285          8   \n",
        "33        NaN     0    2012-09-27    2013-03-31        3          1   \n",
        "34        NaN     0    2012-12-10    2013-02-27        2          1   \n",
        "36        NaN     0    2013-02-20    2013-06-29       80          5   \n",
        "37        NaN     0    2012-10-13           NaN      NaN          1   \n",
        "41        NaN   NaN    2012-12-20    2013-03-14       21          3   \n",
        "43        NaN     0    2013-04-22    2013-04-23        1          1   \n",
        "...       ...   ...           ...           ...      ...        ...   \n",
        "641083      m   NaN    2013-09-07    2013-09-07      116          1   \n",
        "641084      m   NaN    2013-09-07    2013-09-07      245          1   \n",
        "641085      m   NaN    2013-09-07    2013-09-07      169          1   \n",
        "641086      m   NaN    2013-09-07    2013-09-07        3          1   \n",
        "641088      m   NaN    2013-09-07    2013-09-07        1          1   \n",
        "641089      m   NaN    2013-09-07    2013-09-07       82          1   \n",
        "641099      m   NaN    2013-09-07    2013-09-07      242          1   \n",
        "641100      f   NaN    2013-09-07    2013-09-07       94          1   \n",
        "641101      m   NaN    2013-09-07           NaN      NaN        NaN   \n",
        "641102      m   NaN    2013-09-07    2013-09-07       25          1   \n",
        "641103      m   NaN    2013-09-07    2013-09-07       11          1   \n",
        "641107      m   NaN    2013-09-07    2013-09-07      153          1   \n",
        "641108      m   NaN    2013-09-07    2013-09-07       59          1   \n",
        "641109      m   NaN    2013-09-07           NaN      NaN        NaN   \n",
        "641110      m   NaN    2013-09-07    2013-09-07      395          1   \n",
        "641111      m   NaN    2013-09-07    2013-09-07       49          1   \n",
        "641113      m     0    2013-09-07    2013-09-07        8          1   \n",
        "641114      m   NaN    2013-09-07    2013-09-07       22          1   \n",
        "641115      f   NaN    2013-09-07    2013-09-07        2          1   \n",
        "641117      m   NaN    2013-09-07    2013-09-07        2          1   \n",
        "641119      m   NaN    2013-09-07    2013-09-07        2          1   \n",
        "641120      m     0    2013-09-07    2013-09-07       49          1   \n",
        "641121      m   NaN    2013-09-07           NaN      NaN        NaN   \n",
        "641124      m   NaN    2013-09-07    2013-09-07       59          1   \n",
        "641126      m   NaN    2013-09-07    2013-09-07      251          1   \n",
        "641128      m   NaN    2013-09-07    2013-09-07       51          1   \n",
        "641131      m   NaN    2013-09-07    2013-09-07       11          1   \n",
        "641132      m   NaN    2013-09-07    2013-09-07       29          1   \n",
        "641133      m   NaN    2013-09-07    2013-09-07       97          1   \n",
        "641136      m   NaN    2013-09-07    2013-09-07       74          1   \n",
        "\n",
        "        nplay_video  nchapters  nforum_posts  roles  incomplete_flag  \n",
        "1               NaN          1             0    NaN                1  \n",
        "5                50         12             0    NaN              NaN  \n",
        "7               NaN          3             0    NaN              NaN  \n",
        "8               NaN          3             0    NaN              NaN  \n",
        "9               NaN          3             0    NaN                1  \n",
        "10              NaN          2             0    NaN              NaN  \n",
        "11              NaN          3             0    NaN              NaN  \n",
        "12              NaN          7             0    NaN              NaN  \n",
        "13              NaN          2             0    NaN                1  \n",
        "14              NaN          4             0    NaN              NaN  \n",
        "15                5          2             0    NaN              NaN  \n",
        "16                2          1             0    NaN              NaN  \n",
        "17              NaN          1             0    NaN                1  \n",
        "18                1          2             1    NaN              NaN  \n",
        "19              NaN          1             0    NaN                1  \n",
        "20              NaN          2             0    NaN              NaN  \n",
        "21              NaN          1             0    NaN                1  \n",
        "22              NaN          1             0    NaN                1  \n",
        "23              NaN          2             0    NaN              NaN  \n",
        "24              NaN          2             0    NaN              NaN  \n",
        "26              NaN          3             0    NaN                1  \n",
        "27              NaN          5             0    NaN              NaN  \n",
        "28              NaN          1             0    NaN                1  \n",
        "29              NaN          4             0    NaN              NaN  \n",
        "33              NaN          1             0    NaN              NaN  \n",
        "34              NaN          5             0    NaN              NaN  \n",
        "36              NaN          2             0    NaN              NaN  \n",
        "37              NaN          1             0    NaN                1  \n",
        "41              NaN          1             0    NaN              NaN  \n",
        "43              NaN          2             0    NaN              NaN  \n",
        "...             ...        ...           ...    ...              ...  \n",
        "641083           20          2             0    NaN              NaN  \n",
        "641084           56          1             0    NaN              NaN  \n",
        "641085           45          3             0    NaN              NaN  \n",
        "641086          NaN          1             0    NaN              NaN  \n",
        "641088          NaN          3             0    NaN              NaN  \n",
        "641089           16          5             0    NaN              NaN  \n",
        "641099           22          5             0    NaN              NaN  \n",
        "641100            7          2             0    NaN              NaN  \n",
        "641101          NaN          1             0    NaN                1  \n",
        "641102          NaN          2             0    NaN              NaN  \n",
        "641103            2          2             0    NaN              NaN  \n",
        "641107           31          2             0    NaN              NaN  \n",
        "641108            5          3             0    NaN              NaN  \n",
        "641109          NaN          2             0    NaN                1  \n",
        "641110           51          4             0    NaN              NaN  \n",
        "641111           14          2             0    NaN              NaN  \n",
        "641113          NaN          1             0    NaN              NaN  \n",
        "641114            5          1             0    NaN              NaN  \n",
        "641115          NaN          3             0    NaN              NaN  \n",
        "641117          NaN          3             0    NaN              NaN  \n",
        "641119          NaN          2             0    NaN              NaN  \n",
        "641120          NaN          1             0    NaN              NaN  \n",
        "641121          NaN          7             0    NaN                1  \n",
        "641124          NaN          2             0    NaN              NaN  \n",
        "641126           77          4             0    NaN              NaN  \n",
        "641128            1          1             0    NaN              NaN  \n",
        "641131          NaN          2             0    NaN              NaN  \n",
        "641132          NaN          1             0    NaN              NaN  \n",
        "641133            4          2             0    NaN              NaN  \n",
        "641136           14          1             0    NaN              NaN  \n",
        "\n",
        "[382385 rows x 20 columns]"
       ]
      }
     ],
     "prompt_number": 64
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "#Stages  of boolean indexing\n",
      "- select column whose values you're interested in, e.g. df['nchapters']\n",
      "- evaluate the result according to some test, e.g. df['nchapters']>0\n",
      "    -that produces a *boolean* series\n",
      "- use the boolean series to select the rows from the dataframe\n",
      "    - df[df['nchapters]>0]\n",
      "    results in a dataframe with only the rows that meet the test"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "country_not_france=(country_series!='France')"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 54
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "country_not_france"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 55,
       "text": [
        "0      True\n",
        "1      True\n",
        "2      True\n",
        "3      True\n",
        "4      True\n",
        "5      True\n",
        "6      True\n",
        "7     False\n",
        "8      True\n",
        "9      True\n",
        "10     True\n",
        "11     True\n",
        "12     True\n",
        "13     True\n",
        "14     True\n",
        "...\n",
        "641123    True\n",
        "641124    True\n",
        "641125    True\n",
        "641126    True\n",
        "641127    True\n",
        "641128    True\n",
        "641129    True\n",
        "641130    True\n",
        "641131    True\n",
        "641132    True\n",
        "641133    True\n",
        "641134    True\n",
        "641135    True\n",
        "641136    True\n",
        "641137    True\n",
        "Name: final_cc_cname_DI, Length: 641138, dtype: bool"
       ]
      }
     ],
     "prompt_number": 55
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [],
     "language": "python",
     "metadata": {},
     "outputs": []
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "df[df['final_cc_cname_DI']=='France']"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "html": [
        "<div style=\"max-height:1000px;max-width:1500px;overflow:auto;\">\n",
        "<table border=\"1\" class=\"dataframe\">\n",
        "  <thead>\n",
        "    <tr style=\"text-align: right;\">\n",
        "      <th></th>\n",
        "      <th>course_id</th>\n",
        "      <th>userid_DI</th>\n",
        "      <th>registered</th>\n",
        "      <th>viewed</th>\n",
        "      <th>explored</th>\n",
        "      <th>certified</th>\n",
        "      <th>final_cc_cname_DI</th>\n",
        "      <th>LoE_DI</th>\n",
        "      <th>YoB</th>\n",
        "      <th>gender</th>\n",
        "      <th>grade</th>\n",
        "      <th>start_time_DI</th>\n",
        "      <th>last_event_DI</th>\n",
        "      <th>nevents</th>\n",
        "      <th>ndays_act</th>\n",
        "      <th>nplay_video</th>\n",
        "      <th>nchapters</th>\n",
        "      <th>nforum_posts</th>\n",
        "      <th>roles</th>\n",
        "      <th>incomplete_flag</th>\n",
        "    </tr>\n",
        "  </thead>\n",
        "  <tbody>\n",
        "    <tr>\n",
        "      <th>7     </th>\n",
        "      <td>  HarvardX/CB22x/2013_Spring</td>\n",
        "      <td> MHxPC130539455</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2013-01-01</td>\n",
        "      <td> 2013-05-14</td>\n",
        "      <td>   42</td>\n",
        "      <td>  6</td>\n",
        "      <td> NaN</td>\n",
        "      <td>  3</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>256   </th>\n",
        "      <td>         HarvardX/CS50x/2012</td>\n",
        "      <td> MHxPC130595891</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2012-11-03</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>  2</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>423   </th>\n",
        "      <td>         HarvardX/CS50x/2012</td>\n",
        "      <td> MHxPC130247412</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2012-08-03</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>449   </th>\n",
        "      <td>  HarvardX/CB22x/2013_Spring</td>\n",
        "      <td> MHxPC130170185</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td> 0.06</td>\n",
        "      <td> 2013-01-23</td>\n",
        "      <td> 2013-08-11</td>\n",
        "      <td>  231</td>\n",
        "      <td>  8</td>\n",
        "      <td> NaN</td>\n",
        "      <td>  5</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>730   </th>\n",
        "      <td>         HarvardX/CS50x/2012</td>\n",
        "      <td> MHxPC130254688</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2012-08-11</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>  2</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>807   </th>\n",
        "      <td>  HarvardX/ER22x/2013_Spring</td>\n",
        "      <td> MHxPC130156847</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2013-01-14</td>\n",
        "      <td> 2013-06-25</td>\n",
        "      <td>   41</td>\n",
        "      <td>  1</td>\n",
        "      <td> NaN</td>\n",
        "      <td>  3</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>928   </th>\n",
        "      <td>         HarvardX/CS50x/2012</td>\n",
        "      <td> MHxPC130058577</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2013-01-07</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>  1</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>1078  </th>\n",
        "      <td>         HarvardX/CS50x/2012</td>\n",
        "      <td> MHxPC130323627</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2012-08-23</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>1079  </th>\n",
        "      <td>   HarvardX/PH207x/2012_Fall</td>\n",
        "      <td> MHxPC130323627</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2012-08-23</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>1171  </th>\n",
        "      <td>         HarvardX/CS50x/2012</td>\n",
        "      <td> MHxPC130270571</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2012-08-17</td>\n",
        "      <td> 2013-06-07</td>\n",
        "      <td>   10</td>\n",
        "      <td>  2</td>\n",
        "      <td> NaN</td>\n",
        "      <td>  4</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>1236  </th>\n",
        "      <td>  HarvardX/CB22x/2013_Spring</td>\n",
        "      <td> MHxPC130078849</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2013-02-15</td>\n",
        "      <td> 2013-02-15</td>\n",
        "      <td>    1</td>\n",
        "      <td>  1</td>\n",
        "      <td> NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>1237  </th>\n",
        "      <td>         HarvardX/CS50x/2012</td>\n",
        "      <td> MHxPC130078849</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2013-02-15</td>\n",
        "      <td> 2013-02-15</td>\n",
        "      <td>    1</td>\n",
        "      <td>  1</td>\n",
        "      <td> NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>1238  </th>\n",
        "      <td>  HarvardX/ER22x/2013_Spring</td>\n",
        "      <td> MHxPC130078849</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2013-02-15</td>\n",
        "      <td> 2013-02-15</td>\n",
        "      <td>    1</td>\n",
        "      <td>  1</td>\n",
        "      <td> NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>1239  </th>\n",
        "      <td> HarvardX/PH278x/2013_Spring</td>\n",
        "      <td> MHxPC130078849</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2013-02-15</td>\n",
        "      <td> 2013-02-15</td>\n",
        "      <td>    1</td>\n",
        "      <td>  1</td>\n",
        "      <td> NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>1394  </th>\n",
        "      <td>         HarvardX/CS50x/2012</td>\n",
        "      <td> MHxPC130217709</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2013-01-21</td>\n",
        "      <td> 2013-05-27</td>\n",
        "      <td>  455</td>\n",
        "      <td> 48</td>\n",
        "      <td> NaN</td>\n",
        "      <td> 12</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>1535  </th>\n",
        "      <td>         HarvardX/CS50x/2012</td>\n",
        "      <td> MHxPC130075520</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2012-09-12</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td>  1</td>\n",
        "      <td> NaN</td>\n",
        "      <td>  3</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>1536  </th>\n",
        "      <td>  HarvardX/ER22x/2013_Spring</td>\n",
        "      <td> MHxPC130075520</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2013-03-03</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td>  1</td>\n",
        "      <td> NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>1577  </th>\n",
        "      <td>         HarvardX/CS50x/2012</td>\n",
        "      <td> MHxPC130221204</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2012-08-23</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>1607  </th>\n",
        "      <td>  HarvardX/ER22x/2013_Spring</td>\n",
        "      <td> MHxPC130191457</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2013-01-14</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td>  2</td>\n",
        "      <td> NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>1665  </th>\n",
        "      <td>         HarvardX/CS50x/2012</td>\n",
        "      <td> MHxPC130438857</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2012-10-08</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>  2</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>1825  </th>\n",
        "      <td>  HarvardX/ER22x/2013_Spring</td>\n",
        "      <td> MHxPC130020425</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2012-12-21</td>\n",
        "      <td> 2013-03-13</td>\n",
        "      <td>   17</td>\n",
        "      <td>  1</td>\n",
        "      <td> NaN</td>\n",
        "      <td>  1</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>1826  </th>\n",
        "      <td> HarvardX/PH278x/2013_Spring</td>\n",
        "      <td> MHxPC130020425</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2012-12-21</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td>  1</td>\n",
        "      <td> NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>1947  </th>\n",
        "      <td>  HarvardX/CB22x/2013_Spring</td>\n",
        "      <td> MHxPC130365176</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2012-12-21</td>\n",
        "      <td> 2013-11-17</td>\n",
        "      <td>  NaN</td>\n",
        "      <td>  1</td>\n",
        "      <td> NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>1948  </th>\n",
        "      <td>         HarvardX/CS50x/2012</td>\n",
        "      <td> MHxPC130365176</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2012-12-21</td>\n",
        "      <td> 2013-05-17</td>\n",
        "      <td>    6</td>\n",
        "      <td>  2</td>\n",
        "      <td> NaN</td>\n",
        "      <td>  2</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>1949  </th>\n",
        "      <td>  HarvardX/ER22x/2013_Spring</td>\n",
        "      <td> MHxPC130365176</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2012-12-21</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td>  1</td>\n",
        "      <td> NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>1950  </th>\n",
        "      <td> HarvardX/PH278x/2013_Spring</td>\n",
        "      <td> MHxPC130365176</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2012-12-21</td>\n",
        "      <td> 2013-03-06</td>\n",
        "      <td>    1</td>\n",
        "      <td>  1</td>\n",
        "      <td> NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>2524  </th>\n",
        "      <td>         HarvardX/CS50x/2012</td>\n",
        "      <td> MHxPC130304462</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2012-11-10</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>  1</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>2745  </th>\n",
        "      <td>         HarvardX/CS50x/2012</td>\n",
        "      <td> MHxPC130509069</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2012-08-19</td>\n",
        "      <td> 2013-03-24</td>\n",
        "      <td>   32</td>\n",
        "      <td>  2</td>\n",
        "      <td> NaN</td>\n",
        "      <td> 12</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>2810  </th>\n",
        "      <td>         HarvardX/CS50x/2012</td>\n",
        "      <td> MHxPC130475365</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>  0.0</td>\n",
        "      <td> 2012-09-05</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>2926  </th>\n",
        "      <td>   HarvardX/PH207x/2012_Fall</td>\n",
        "      <td> MHxPC130597633</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td> 0.11</td>\n",
        "      <td> 2012-10-17</td>\n",
        "      <td> 2012-11-05</td>\n",
        "      <td> 1465</td>\n",
        "      <td>  7</td>\n",
        "      <td> 202</td>\n",
        "      <td>  4</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>...</th>\n",
        "      <td>...</td>\n",
        "      <td>...</td>\n",
        "      <td>...</td>\n",
        "      <td>...</td>\n",
        "      <td>...</td>\n",
        "      <td>...</td>\n",
        "      <td>...</td>\n",
        "      <td>...</td>\n",
        "      <td>...</td>\n",
        "      <td>...</td>\n",
        "      <td>...</td>\n",
        "      <td>...</td>\n",
        "      <td>...</td>\n",
        "      <td>...</td>\n",
        "      <td>...</td>\n",
        "      <td>...</td>\n",
        "      <td>...</td>\n",
        "      <td>...</td>\n",
        "      <td>...</td>\n",
        "      <td>...</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>637976</th>\n",
        "      <td>     MITx/14.73x/2013_Spring</td>\n",
        "      <td> MHxPC130061822</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td>   Master's</td>\n",
        "      <td> 1988</td>\n",
        "      <td>   f</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-08-25</td>\n",
        "      <td> 2013-08-25</td>\n",
        "      <td>   43</td>\n",
        "      <td>  1</td>\n",
        "      <td>   6</td>\n",
        "      <td>  2</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>638023</th>\n",
        "      <td>     MITx/14.73x/2013_Spring</td>\n",
        "      <td> MHxPC130125559</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td>   Master's</td>\n",
        "      <td> 1990</td>\n",
        "      <td>   f</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-08-25</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>638069</th>\n",
        "      <td>      MITx/8.02x/2013_Spring</td>\n",
        "      <td> MHxPC130285866</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-08-25</td>\n",
        "      <td> 2013-08-25</td>\n",
        "      <td>    1</td>\n",
        "      <td>  1</td>\n",
        "      <td> NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>638158</th>\n",
        "      <td>     MITx/14.73x/2013_Spring</td>\n",
        "      <td> MHxPC130260318</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td>   Master's</td>\n",
        "      <td> 1981</td>\n",
        "      <td>   f</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-08-26</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>638426</th>\n",
        "      <td>      MITx/6.00x/2013_Spring</td>\n",
        "      <td> MHxPC130491596</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td>   Master's</td>\n",
        "      <td> 1987</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-08-27</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 2670</td>\n",
        "      <td> 11</td>\n",
        "      <td> 264</td>\n",
        "      <td> 12</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>638469</th>\n",
        "      <td>      MITx/6.00x/2013_Spring</td>\n",
        "      <td> MHxPC130564866</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td> Bachelor's</td>\n",
        "      <td> 1984</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-08-27</td>\n",
        "      <td> 2013-08-28</td>\n",
        "      <td>    9</td>\n",
        "      <td>  2</td>\n",
        "      <td>   1</td>\n",
        "      <td>  1</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>638570</th>\n",
        "      <td>      MITx/6.00x/2013_Spring</td>\n",
        "      <td> MHxPC130169377</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-08-28</td>\n",
        "      <td> 2013-08-30</td>\n",
        "      <td>  443</td>\n",
        "      <td>  3</td>\n",
        "      <td>  58</td>\n",
        "      <td>  3</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>638668</th>\n",
        "      <td>     MITx/14.73x/2013_Spring</td>\n",
        "      <td> MHxPC130027500</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td>   Master's</td>\n",
        "      <td> 1975</td>\n",
        "      <td>   f</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-08-28</td>\n",
        "      <td> 2013-09-04</td>\n",
        "      <td>  641</td>\n",
        "      <td>  4</td>\n",
        "      <td>  61</td>\n",
        "      <td>  3</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>638681</th>\n",
        "      <td>     MITx/14.73x/2013_Spring</td>\n",
        "      <td> MHxPC130529177</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td>   Master's</td>\n",
        "      <td> 1988</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-08-28</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>  3</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>638713</th>\n",
        "      <td>     MITx/6.002x/2013_Spring</td>\n",
        "      <td> MHxPC130484595</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-08-28</td>\n",
        "      <td> 2013-08-28</td>\n",
        "      <td>   15</td>\n",
        "      <td>  1</td>\n",
        "      <td>   7</td>\n",
        "      <td>  2</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>638814</th>\n",
        "      <td>      MITx/6.00x/2013_Spring</td>\n",
        "      <td> MHxPC130144367</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td>   Master's</td>\n",
        "      <td> 1990</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-08-28</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>638825</th>\n",
        "      <td>     MITx/14.73x/2013_Spring</td>\n",
        "      <td> MHxPC130430070</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-08-28</td>\n",
        "      <td> 2013-08-28</td>\n",
        "      <td>    1</td>\n",
        "      <td>  1</td>\n",
        "      <td> NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>638835</th>\n",
        "      <td>      MITx/6.00x/2013_Spring</td>\n",
        "      <td> MHxPC130138357</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td>   Master's</td>\n",
        "      <td> 1987</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-01</td>\n",
        "      <td> 2013-09-01</td>\n",
        "      <td>  681</td>\n",
        "      <td>  1</td>\n",
        "      <td> 261</td>\n",
        "      <td>  5</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>638959</th>\n",
        "      <td>     MITx/14.73x/2013_Spring</td>\n",
        "      <td> MHxPC130128755</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td>   Master's</td>\n",
        "      <td> 1988</td>\n",
        "      <td>   f</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-08-29</td>\n",
        "      <td> 2013-08-29</td>\n",
        "      <td>    3</td>\n",
        "      <td>  1</td>\n",
        "      <td> NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>639270</th>\n",
        "      <td>      MITx/6.00x/2013_Spring</td>\n",
        "      <td> MHxPC130520698</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td>   Master's</td>\n",
        "      <td> 1991</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-03</td>\n",
        "      <td> 2013-09-06</td>\n",
        "      <td>   26</td>\n",
        "      <td>  4</td>\n",
        "      <td>   5</td>\n",
        "      <td>  1</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>639317</th>\n",
        "      <td>      MITx/6.00x/2013_Spring</td>\n",
        "      <td> MHxPC130301343</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td>   Master's</td>\n",
        "      <td> 1984</td>\n",
        "      <td>   f</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-08-30</td>\n",
        "      <td> 2013-08-30</td>\n",
        "      <td>   58</td>\n",
        "      <td>  1</td>\n",
        "      <td>   9</td>\n",
        "      <td>  5</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>639722</th>\n",
        "      <td>     MITx/6.002x/2013_Spring</td>\n",
        "      <td> MHxPC130413420</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td> Bachelor's</td>\n",
        "      <td> 1990</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-01</td>\n",
        "      <td> 2013-09-02</td>\n",
        "      <td>   25</td>\n",
        "      <td>  2</td>\n",
        "      <td>   2</td>\n",
        "      <td>  2</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>639723</th>\n",
        "      <td>      MITx/6.00x/2013_Spring</td>\n",
        "      <td> MHxPC130413420</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td> Bachelor's</td>\n",
        "      <td> 1990</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-01</td>\n",
        "      <td> 2013-09-01</td>\n",
        "      <td>   23</td>\n",
        "      <td>  1</td>\n",
        "      <td>   2</td>\n",
        "      <td>  2</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>639807</th>\n",
        "      <td>      MITx/6.00x/2013_Spring</td>\n",
        "      <td> MHxPC130045331</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td> Bachelor's</td>\n",
        "      <td> 1990</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-01</td>\n",
        "      <td> 2013-09-01</td>\n",
        "      <td>   40</td>\n",
        "      <td>  1</td>\n",
        "      <td>  13</td>\n",
        "      <td>  2</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>640128</th>\n",
        "      <td>     MITx/8.MReV/2013_Summer</td>\n",
        "      <td> MHxPC130373510</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>    0</td>\n",
        "      <td> 2013-09-03</td>\n",
        "      <td> 2013-09-03</td>\n",
        "      <td>    4</td>\n",
        "      <td>  1</td>\n",
        "      <td> NaN</td>\n",
        "      <td>  1</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>640208</th>\n",
        "      <td>      MITx/6.00x/2013_Spring</td>\n",
        "      <td> MHxPC130000556</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td>   Master's</td>\n",
        "      <td> 1989</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-03</td>\n",
        "      <td> 2013-09-03</td>\n",
        "      <td>   19</td>\n",
        "      <td>  1</td>\n",
        "      <td> NaN</td>\n",
        "      <td>  3</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>640249</th>\n",
        "      <td>      MITx/6.00x/2013_Spring</td>\n",
        "      <td> MHxPC130323078</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td> Bachelor's</td>\n",
        "      <td> 1989</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-03</td>\n",
        "      <td>        NaN</td>\n",
        "      <td>  NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> NaN</td>\n",
        "      <td>  3</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>  1</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>640463</th>\n",
        "      <td>     MITx/14.73x/2013_Spring</td>\n",
        "      <td> MHxPC130393176</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td>   Master's</td>\n",
        "      <td> 1983</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-04</td>\n",
        "      <td> 2013-09-04</td>\n",
        "      <td>    7</td>\n",
        "      <td>  1</td>\n",
        "      <td>   1</td>\n",
        "      <td>  1</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>640487</th>\n",
        "      <td>     MITx/14.73x/2013_Spring</td>\n",
        "      <td> MHxPC130280987</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td>   Master's</td>\n",
        "      <td> 1986</td>\n",
        "      <td>   f</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-04</td>\n",
        "      <td> 2013-09-04</td>\n",
        "      <td>    1</td>\n",
        "      <td>  1</td>\n",
        "      <td> NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>640506</th>\n",
        "      <td>     MITx/14.73x/2013_Spring</td>\n",
        "      <td> MHxPC130447919</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td>  Secondary</td>\n",
        "      <td> 1990</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-04</td>\n",
        "      <td> 2013-09-04</td>\n",
        "      <td>    1</td>\n",
        "      <td>  1</td>\n",
        "      <td> NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>640579</th>\n",
        "      <td>      MITx/6.00x/2013_Spring</td>\n",
        "      <td> MHxPC130195185</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td>   Master's</td>\n",
        "      <td> 1972</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-04</td>\n",
        "      <td> 2013-09-05</td>\n",
        "      <td> 1120</td>\n",
        "      <td>  2</td>\n",
        "      <td> 111</td>\n",
        "      <td>  3</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>640646</th>\n",
        "      <td>      MITx/6.00x/2013_Spring</td>\n",
        "      <td> MHxPC130546344</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td>   Master's</td>\n",
        "      <td> 1980</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-05</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td>  930</td>\n",
        "      <td>  3</td>\n",
        "      <td>  57</td>\n",
        "      <td> 13</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>640655</th>\n",
        "      <td>      MITx/6.00x/2013_Spring</td>\n",
        "      <td> MHxPC130068634</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td>   Master's</td>\n",
        "      <td> 1990</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-05</td>\n",
        "      <td> 2013-09-05</td>\n",
        "      <td>    1</td>\n",
        "      <td>  1</td>\n",
        "      <td> NaN</td>\n",
        "      <td>NaN</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>640898</th>\n",
        "      <td>     MITx/14.73x/2013_Spring</td>\n",
        "      <td> MHxPC130556151</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td> Bachelor's</td>\n",
        "      <td> 1990</td>\n",
        "      <td>   f</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td> 2013-09-07</td>\n",
        "      <td>   40</td>\n",
        "      <td>  1</td>\n",
        "      <td>   5</td>\n",
        "      <td>  1</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
        "      <th>640935</th>\n",
        "      <td>      MITx/6.00x/2013_Spring</td>\n",
        "      <td> MHxPC130405848</td>\n",
        "      <td> 1</td>\n",
        "      <td> 1</td>\n",
        "      <td> 0</td>\n",
        "      <td> 0</td>\n",
        "      <td> France</td>\n",
        "      <td> Bachelor's</td>\n",
        "      <td> 1988</td>\n",
        "      <td>   m</td>\n",
        "      <td>  NaN</td>\n",
        "      <td> 2013-09-06</td>\n",
        "      <td> 2013-09-06</td>\n",
        "      <td>   69</td>\n",
        "      <td>  1</td>\n",
        "      <td>   7</td>\n",
        "      <td>  4</td>\n",
        "      <td> 0</td>\n",
        "      <td>NaN</td>\n",
        "      <td>NaN</td>\n",
        "    </tr>\n",
        "  </tbody>\n",
        "</table>\n",
        "<p>4700 rows \u00d7 20 columns</p>\n",
        "</div>"
       ],
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 45,
       "text": [
        "                          course_id       userid_DI  registered  viewed  \\\n",
        "7        HarvardX/CB22x/2013_Spring  MHxPC130539455           1       1   \n",
        "256             HarvardX/CS50x/2012  MHxPC130595891           1       1   \n",
        "423             HarvardX/CS50x/2012  MHxPC130247412           1       0   \n",
        "449      HarvardX/CB22x/2013_Spring  MHxPC130170185           1       1   \n",
        "730             HarvardX/CS50x/2012  MHxPC130254688           1       1   \n",
        "807      HarvardX/ER22x/2013_Spring  MHxPC130156847           1       1   \n",
        "928             HarvardX/CS50x/2012  MHxPC130058577           1       1   \n",
        "1078            HarvardX/CS50x/2012  MHxPC130323627           1       0   \n",
        "1079      HarvardX/PH207x/2012_Fall  MHxPC130323627           1       0   \n",
        "1171            HarvardX/CS50x/2012  MHxPC130270571           1       1   \n",
        "1236     HarvardX/CB22x/2013_Spring  MHxPC130078849           1       0   \n",
        "1237            HarvardX/CS50x/2012  MHxPC130078849           1       0   \n",
        "1238     HarvardX/ER22x/2013_Spring  MHxPC130078849           1       0   \n",
        "1239    HarvardX/PH278x/2013_Spring  MHxPC130078849           1       0   \n",
        "1394            HarvardX/CS50x/2012  MHxPC130217709           1       1   \n",
        "1535            HarvardX/CS50x/2012  MHxPC130075520           1       1   \n",
        "1536     HarvardX/ER22x/2013_Spring  MHxPC130075520           1       0   \n",
        "1577            HarvardX/CS50x/2012  MHxPC130221204           1       0   \n",
        "1607     HarvardX/ER22x/2013_Spring  MHxPC130191457           1       0   \n",
        "1665            HarvardX/CS50x/2012  MHxPC130438857           1       1   \n",
        "1825     HarvardX/ER22x/2013_Spring  MHxPC130020425           1       1   \n",
        "1826    HarvardX/PH278x/2013_Spring  MHxPC130020425           1       0   \n",
        "1947     HarvardX/CB22x/2013_Spring  MHxPC130365176           1       0   \n",
        "1948            HarvardX/CS50x/2012  MHxPC130365176           1       1   \n",
        "1949     HarvardX/ER22x/2013_Spring  MHxPC130365176           1       0   \n",
        "1950    HarvardX/PH278x/2013_Spring  MHxPC130365176           1       0   \n",
        "2524            HarvardX/CS50x/2012  MHxPC130304462           1       1   \n",
        "2745            HarvardX/CS50x/2012  MHxPC130509069           1       1   \n",
        "2810            HarvardX/CS50x/2012  MHxPC130475365           1       0   \n",
        "2926      HarvardX/PH207x/2012_Fall  MHxPC130597633           1       1   \n",
        "...                             ...             ...         ...     ...   \n",
        "637976      MITx/14.73x/2013_Spring  MHxPC130061822           1       1   \n",
        "638023      MITx/14.73x/2013_Spring  MHxPC130125559           1       0   \n",
        "638069       MITx/8.02x/2013_Spring  MHxPC130285866           1       0   \n",
        "638158      MITx/14.73x/2013_Spring  MHxPC130260318           1       0   \n",
        "638426       MITx/6.00x/2013_Spring  MHxPC130491596           1       1   \n",
        "638469       MITx/6.00x/2013_Spring  MHxPC130564866           1       1   \n",
        "638570       MITx/6.00x/2013_Spring  MHxPC130169377           1       1   \n",
        "638668      MITx/14.73x/2013_Spring  MHxPC130027500           1       1   \n",
        "638681      MITx/14.73x/2013_Spring  MHxPC130529177           1       0   \n",
        "638713      MITx/6.002x/2013_Spring  MHxPC130484595           1       1   \n",
        "638814       MITx/6.00x/2013_Spring  MHxPC130144367           1       0   \n",
        "638825      MITx/14.73x/2013_Spring  MHxPC130430070           1       0   \n",
        "638835       MITx/6.00x/2013_Spring  MHxPC130138357           1       1   \n",
        "638959      MITx/14.73x/2013_Spring  MHxPC130128755           1       0   \n",
        "639270       MITx/6.00x/2013_Spring  MHxPC130520698           1       1   \n",
        "639317       MITx/6.00x/2013_Spring  MHxPC130301343           1       1   \n",
        "639722      MITx/6.002x/2013_Spring  MHxPC130413420           1       1   \n",
        "639723       MITx/6.00x/2013_Spring  MHxPC130413420           1       1   \n",
        "639807       MITx/6.00x/2013_Spring  MHxPC130045331           1       1   \n",
        "640128      MITx/8.MReV/2013_Summer  MHxPC130373510           1       1   \n",
        "640208       MITx/6.00x/2013_Spring  MHxPC130000556           1       1   \n",
        "640249       MITx/6.00x/2013_Spring  MHxPC130323078           1       0   \n",
        "640463      MITx/14.73x/2013_Spring  MHxPC130393176           1       1   \n",
        "640487      MITx/14.73x/2013_Spring  MHxPC130280987           1       0   \n",
        "640506      MITx/14.73x/2013_Spring  MHxPC130447919           1       0   \n",
        "640579       MITx/6.00x/2013_Spring  MHxPC130195185           1       1   \n",
        "640646       MITx/6.00x/2013_Spring  MHxPC130546344           1       1   \n",
        "640655       MITx/6.00x/2013_Spring  MHxPC130068634           1       0   \n",
        "640898      MITx/14.73x/2013_Spring  MHxPC130556151           1       1   \n",
        "640935       MITx/6.00x/2013_Spring  MHxPC130405848           1       1   \n",
        "\n",
        "        explored  certified final_cc_cname_DI      LoE_DI   YoB gender grade  \\\n",
        "7              0          0            France         NaN   NaN    NaN     0   \n",
        "256            0          0            France         NaN   NaN    NaN     0   \n",
        "423            0          0            France         NaN   NaN    NaN     0   \n",
        "449            0          0            France         NaN   NaN    NaN  0.06   \n",
        "730            0          0            France         NaN   NaN    NaN     0   \n",
        "807            0          0            France         NaN   NaN    NaN     0   \n",
        "928            0          0            France         NaN   NaN    NaN     0   \n",
        "1078           0          0            France         NaN   NaN    NaN     0   \n",
        "1079           0          0            France         NaN   NaN    NaN     0   \n",
        "1171           0          0            France         NaN   NaN    NaN     0   \n",
        "1236           0          0            France         NaN   NaN    NaN     0   \n",
        "1237           0          0            France         NaN   NaN    NaN     0   \n",
        "1238           0          0            France         NaN   NaN    NaN     0   \n",
        "1239           0          0            France         NaN   NaN    NaN     0   \n",
        "1394           1          0            France         NaN   NaN    NaN     0   \n",
        "1535           0          0            France         NaN   NaN    NaN     0   \n",
        "1536           0          0            France         NaN   NaN    NaN     0   \n",
        "1577           0          0            France         NaN   NaN    NaN     0   \n",
        "1607           0          0            France         NaN   NaN    NaN     0   \n",
        "1665           0          0            France         NaN   NaN    NaN     0   \n",
        "1825           0          0            France         NaN   NaN    NaN     0   \n",
        "1826           0          0            France         NaN   NaN    NaN     0   \n",
        "1947           0          0            France         NaN   NaN    NaN     0   \n",
        "1948           0          0            France         NaN   NaN    NaN     0   \n",
        "1949           0          0            France         NaN   NaN    NaN     0   \n",
        "1950           0          0            France         NaN   NaN    NaN     0   \n",
        "2524           0          0            France         NaN   NaN    NaN     0   \n",
        "2745           1          0            France         NaN   NaN    NaN     0   \n",
        "2810           0          0            France         NaN   NaN    NaN   0.0   \n",
        "2926           0          0            France         NaN   NaN    NaN  0.11   \n",
        "...          ...        ...               ...         ...   ...    ...   ...   \n",
        "637976         0          0            France    Master's  1988      f   NaN   \n",
        "638023         0          0            France    Master's  1990      f   NaN   \n",
        "638069         0          0            France         NaN   NaN      m   NaN   \n",
        "638158         0          0            France    Master's  1981      f   NaN   \n",
        "638426         1          0            France    Master's  1987      m   NaN   \n",
        "638469         0          0            France  Bachelor's  1984      m   NaN   \n",
        "638570         0          0            France         NaN   NaN    NaN   NaN   \n",
        "638668         0          0            France    Master's  1975      f   NaN   \n",
        "638681         0          0            France    Master's  1988      m   NaN   \n",
        "638713         0          0            France         NaN   NaN    NaN   NaN   \n",
        "638814         0          0            France    Master's  1990      m   NaN   \n",
        "638825         0          0            France         NaN   NaN    NaN   NaN   \n",
        "638835         0          0            France    Master's  1987      m   NaN   \n",
        "638959         0          0            France    Master's  1988      f   NaN   \n",
        "639270         0          0            France    Master's  1991      m   NaN   \n",
        "639317         0          0            France    Master's  1984      f   NaN   \n",
        "639722         0          0            France  Bachelor's  1990      m   NaN   \n",
        "639723         0          0            France  Bachelor's  1990      m   NaN   \n",
        "639807         0          0            France  Bachelor's  1990      m   NaN   \n",
        "640128         0          0            France         NaN   NaN    NaN     0   \n",
        "640208         0          0            France    Master's  1989      m   NaN   \n",
        "640249         0          0            France  Bachelor's  1989      m   NaN   \n",
        "640463         0          0            France    Master's  1983      m   NaN   \n",
        "640487         0          0            France    Master's  1986      f   NaN   \n",
        "640506         0          0            France   Secondary  1990      m   NaN   \n",
        "640579         0          0            France    Master's  1972      m   NaN   \n",
        "640646         1          0            France    Master's  1980      m   NaN   \n",
        "640655         0          0            France    Master's  1990      m   NaN   \n",
        "640898         0          0            France  Bachelor's  1990      f   NaN   \n",
        "640935         0          0            France  Bachelor's  1988      m   NaN   \n",
        "\n",
        "       start_time_DI last_event_DI  nevents  ndays_act  nplay_video  \\\n",
        "7         2013-01-01    2013-05-14       42          6          NaN   \n",
        "256       2012-11-03           NaN      NaN        NaN          NaN   \n",
        "423       2012-08-03           NaN      NaN        NaN          NaN   \n",
        "449       2013-01-23    2013-08-11      231          8          NaN   \n",
        "730       2012-08-11           NaN      NaN        NaN          NaN   \n",
        "807       2013-01-14    2013-06-25       41          1          NaN   \n",
        "928       2013-01-07           NaN      NaN        NaN          NaN   \n",
        "1078      2012-08-23           NaN      NaN        NaN          NaN   \n",
        "1079      2012-08-23           NaN      NaN        NaN          NaN   \n",
        "1171      2012-08-17    2013-06-07       10          2          NaN   \n",
        "1236      2013-02-15    2013-02-15        1          1          NaN   \n",
        "1237      2013-02-15    2013-02-15        1          1          NaN   \n",
        "1238      2013-02-15    2013-02-15        1          1          NaN   \n",
        "1239      2013-02-15    2013-02-15        1          1          NaN   \n",
        "1394      2013-01-21    2013-05-27      455         48          NaN   \n",
        "1535      2012-09-12           NaN      NaN          1          NaN   \n",
        "1536      2013-03-03           NaN      NaN          1          NaN   \n",
        "1577      2012-08-23           NaN      NaN        NaN          NaN   \n",
        "1607      2013-01-14           NaN      NaN          2          NaN   \n",
        "1665      2012-10-08           NaN      NaN        NaN          NaN   \n",
        "1825      2012-12-21    2013-03-13       17          1          NaN   \n",
        "1826      2012-12-21           NaN      NaN          1          NaN   \n",
        "1947      2012-12-21    2013-11-17      NaN          1          NaN   \n",
        "1948      2012-12-21    2013-05-17        6          2          NaN   \n",
        "1949      2012-12-21           NaN      NaN          1          NaN   \n",
        "1950      2012-12-21    2013-03-06        1          1          NaN   \n",
        "2524      2012-11-10           NaN      NaN        NaN          NaN   \n",
        "2745      2012-08-19    2013-03-24       32          2          NaN   \n",
        "2810      2012-09-05           NaN      NaN        NaN          NaN   \n",
        "2926      2012-10-17    2012-11-05     1465          7          202   \n",
        "...              ...           ...      ...        ...          ...   \n",
        "637976    2013-08-25    2013-08-25       43          1            6   \n",
        "638023    2013-08-25           NaN      NaN        NaN          NaN   \n",
        "638069    2013-08-25    2013-08-25        1          1          NaN   \n",
        "638158    2013-08-26           NaN      NaN        NaN          NaN   \n",
        "638426    2013-08-27    2013-09-07     2670         11          264   \n",
        "638469    2013-08-27    2013-08-28        9          2            1   \n",
        "638570    2013-08-28    2013-08-30      443          3           58   \n",
        "638668    2013-08-28    2013-09-04      641          4           61   \n",
        "638681    2013-08-28           NaN      NaN        NaN          NaN   \n",
        "638713    2013-08-28    2013-08-28       15          1            7   \n",
        "638814    2013-08-28           NaN      NaN        NaN          NaN   \n",
        "638825    2013-08-28    2013-08-28        1          1          NaN   \n",
        "638835    2013-09-01    2013-09-01      681          1          261   \n",
        "638959    2013-08-29    2013-08-29        3          1          NaN   \n",
        "639270    2013-09-03    2013-09-06       26          4            5   \n",
        "639317    2013-08-30    2013-08-30       58          1            9   \n",
        "639722    2013-09-01    2013-09-02       25          2            2   \n",
        "639723    2013-09-01    2013-09-01       23          1            2   \n",
        "639807    2013-09-01    2013-09-01       40          1           13   \n",
        "640128    2013-09-03    2013-09-03        4          1          NaN   \n",
        "640208    2013-09-03    2013-09-03       19          1          NaN   \n",
        "640249    2013-09-03           NaN      NaN        NaN          NaN   \n",
        "640463    2013-09-04    2013-09-04        7          1            1   \n",
        "640487    2013-09-04    2013-09-04        1          1          NaN   \n",
        "640506    2013-09-04    2013-09-04        1          1          NaN   \n",
        "640579    2013-09-04    2013-09-05     1120          2          111   \n",
        "640646    2013-09-05    2013-09-07      930          3           57   \n",
        "640655    2013-09-05    2013-09-05        1          1          NaN   \n",
        "640898    2013-09-07    2013-09-07       40          1            5   \n",
        "640935    2013-09-06    2013-09-06       69          1            7   \n",
        "\n",
        "        nchapters  nforum_posts  roles  incomplete_flag  \n",
        "7               3             0    NaN              NaN  \n",
        "256             2             0    NaN                1  \n",
        "423           NaN             0    NaN              NaN  \n",
        "449             5             0    NaN              NaN  \n",
        "730             2             0    NaN                1  \n",
        "807             3             0    NaN              NaN  \n",
        "928             1             0    NaN                1  \n",
        "1078          NaN             0    NaN              NaN  \n",
        "1079          NaN             0    NaN              NaN  \n",
        "1171            4             0    NaN              NaN  \n",
        "1236          NaN             0    NaN              NaN  \n",
        "1237          NaN             0    NaN              NaN  \n",
        "1238          NaN             0    NaN              NaN  \n",
        "1239          NaN             0    NaN              NaN  \n",
        "1394           12             0    NaN              NaN  \n",
        "1535            3             0    NaN                1  \n",
        "1536          NaN             0    NaN                1  \n",
        "1577          NaN             0    NaN              NaN  \n",
        "1607          NaN             0    NaN                1  \n",
        "1665            2             0    NaN                1  \n",
        "1825            1             0    NaN              NaN  \n",
        "1826          NaN             0    NaN                1  \n",
        "1947          NaN             0    NaN                1  \n",
        "1948            2             0    NaN              NaN  \n",
        "1949          NaN             0    NaN                1  \n",
        "1950          NaN             0    NaN              NaN  \n",
        "2524            1             0    NaN                1  \n",
        "2745           12             0    NaN              NaN  \n",
        "2810          NaN             0    NaN              NaN  \n",
        "2926            4             0    NaN              NaN  \n",
        "...           ...           ...    ...              ...  \n",
        "637976          2             0    NaN              NaN  \n",
        "638023        NaN             0    NaN              NaN  \n",
        "638069        NaN             0    NaN              NaN  \n",
        "638158        NaN             0    NaN              NaN  \n",
        "638426         12             0    NaN              NaN  \n",
        "638469          1             0    NaN              NaN  \n",
        "638570          3             0    NaN              NaN  \n",
        "638668          3             0    NaN              NaN  \n",
        "638681          3             0    NaN                1  \n",
        "638713          2             0    NaN              NaN  \n",
        "638814        NaN             0    NaN              NaN  \n",
        "638825        NaN             0    NaN              NaN  \n",
        "638835          5             0    NaN              NaN  \n",
        "638959        NaN             0    NaN              NaN  \n",
        "639270          1             0    NaN              NaN  \n",
        "639317          5             0    NaN              NaN  \n",
        "639722          2             0    NaN              NaN  \n",
        "639723          2             0    NaN              NaN  \n",
        "639807          2             0    NaN              NaN  \n",
        "640128          1             0    NaN              NaN  \n",
        "640208          3             0    NaN              NaN  \n",
        "640249          3             0    NaN                1  \n",
        "640463          1             0    NaN              NaN  \n",
        "640487        NaN             0    NaN              NaN  \n",
        "640506        NaN             0    NaN              NaN  \n",
        "640579          3             0    NaN              NaN  \n",
        "640646         13             0    NaN              NaN  \n",
        "640655        NaN             0    NaN              NaN  \n",
        "640898          1             0    NaN              NaN  \n",
        "640935          4             0    NaN              NaN  \n",
        "\n",
        "[4700 rows x 20 columns]"
       ]
      }
     ],
     "prompt_number": 45
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [],
     "language": "python",
     "metadata": {},
     "outputs": []
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [],
     "language": "python",
     "metadata": {},
     "outputs": []
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [],
     "language": "python",
     "metadata": {},
     "outputs": []
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "#Part II: Movie ratings-recommender engines"
     ]
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "#Election Mining\n",
      "\n",
      "> Campaigns are moving away from the meaningless labels of pollsters and newsweeklies \u2014 \u201cNascar dads\u201d and \u201cwaitress moms\u201d \u2014 and moving toward treating each voter as a separate person. In 2012 you didn\u2019t just have to be an African-American from Akron or a suburban married female age 45 to 54. More and more, the information age allows people to be complicated, contradictory and unique. New technologies and an abundance of data may rattle the senses, but they are also bringing a fresh appreciation of the value of the individual to American politics.\n",
      "    - Ethan Roeder, \u201cI Am Not Big Brother\u201d http://www.nytimes.com/2012/12/06/opinion/i-am-not-big-brother.html?_r=0.\n"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [],
     "language": "python",
     "metadata": {},
     "outputs": []
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [],
     "language": "python",
     "metadata": {},
     "outputs": []
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "    films=pd.read_csv('./ml-100k/u.item', sep=\"|\", names=[\"movie id\", \"movie_title\", \"release_date\", \"video_release_date\", \"IMDb_URL\", \"unknown\", \"Action\",\"Adventure\", \"Animation\", \"Children's\", \"Comedy\", \"Crime\", \"Documentary\", \"Drama\", \"Fantasy\", \"Film-Noir\", \"Horror\", \"Musical\", \"Mystery\", \"Romance\", \"Sci-Fi\", \"Thriller\", \"War\", \"Western\"])"
     ],
     "language": "python",
     "metadata": {},
     "outputs": []
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "users=pd.read_csv('./ml-100k/u.user', sep=\"|\", names=[\"user_id\", \"age\", \"gender\",\"occupation\",\"zip_code\"], index_col=\"user_id\")"
     ],
     "language": "python",
     "metadata": {},
     "outputs": []
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [],
     "language": "python",
     "metadata": {},
     "outputs": []
    }
   ],
   "metadata": {}
  }
 ]
}