4. Resampling.ipynb

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   "source": [
    "import pandas as pd\n",
    "import numpy as np"
   ]
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   "cell_type": "code",
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   "source": [
    "rng = pd.date_range('1/1/2011', periods=72, freq='H')\n",
    "ts = pd.Series(np.random.randn(len(rng)), index=rng)"
   ]
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   "source": [
    "converted = ts.asfreq('45Min', method='pad')"
   ]
  },
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   "cell_type": "code",
   "execution_count": null,
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   "source": [
    "# Does asfreq change the # of rows?"
   ]
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   "source": [
    "# What do the different methods do?\n",
    "# method : {‘backfill’, ‘bfill’, ‘pad’, ‘ffill’, None}"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
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   "outputs": [],
   "source": [
    "# Might any of these methods have pitfalls from a logical point of view?"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
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   "source": [
    "# What's the difference between going to a higher frequency and a lower frequency?"
   ]
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   "cell_type": "code",
   "execution_count": null,
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   "source": [
    "converted = ts.asfreq('90Min', method = 'bfill')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
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   "source": [
    "# What's different logically about going to a higher frequency vs a lower frequency? \n",
    "# What do you want to do when switching to a lower freqeuncy that is not logical when switching to a higher frequency?"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": false
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   "source": [
    "ts.resample('D').sum()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "# What if you want to downsample and you don't want to ffill or bfill?"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "# What is the difference between .resample() and .asfreq()?"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "# What are some special things you can do with .resample() you can't do with .asfreq()?\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
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