Homework/Day_16_HW.ipynb

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    "作業目標:<br>\n",
    "1. 熟悉時間序列資料運算\n",
    "2. 敘述統計量應用在時間序列資料上\n",
    "\n"
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    "作業重點:<br>\n",
    "1. 須注意時間的間隔問題，例如:一周、一年...\n",
    "2. 敘述統計量一樣可以應用在時間序列資料上"
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    "題目 : 運下列時間序列資料做運算<br>\n",
    "\n",
    "\n",
    "```\n",
    "index = pd.date_range(\"1/1/2019\", periods=20, freq='D')\n",
    "series = pd.Series(range(20), index=index)\n",
    "```\n",
    "\n",
    "\n",
    "1. 將所有轉為周資料\n",
    "2. 將周資料的值取平均"
   ]
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   "source": [
    "import numpy as np\n",
    "import pandas as pd"
   ]
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       "2021-01-01     0\n",
       "2021-01-02     1\n",
       "2021-01-03     2\n",
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       "2021-01-20    19\n",
       "Freq: D, dtype: int64"
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    "index = pd.date_range( '1/1/2021', periods=20, freq='D' )\n",
    "series = pd.Series( range(20), index=index )\n",
    "series"
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       "2020-12-28/2021-01-03     0\n",
       "2020-12-28/2021-01-03     1\n",
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       "2021-01-18/2021-01-24    19\n",
       "Freq: W-SUN, dtype: int64"
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   "source": [
    "# 1. 將所有轉為周資料\n",
    "\n",
    "series.to_period( freq='W' )"
   ]
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       "2021-01-03     1\n",
       "2021-01-10     6\n",
       "2021-01-17    13\n",
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       "Freq: W-SUN, dtype: int64"
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     "execution_count": 4,
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   "source": [
    "# 2. 將周資料的值取平均\n",
    "\n",
    "series.resample('W').mean() "
   ]
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