ri-voter-turnout/ri-voter-turnout.ipynb

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    "Created by [SmirkyGraphs](http://smirkygraphs.github.io/). Code: [GitHub](https://github.com/SmirkyGraphs/Python-Notebooks). Source: [RI BOE](http://www.elections.ri.gov/elections/preresults/).\n",
    "<hr>"
   ]
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   "source": [
    "## Cleaning Voter Turnout "
   ]
  },
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   "source": [
    "using pandas to get voter turnout for each race and by precinct"
   ]
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    "# NOTE \n",
    "# Replaced BALLOT TOTAL with page 1 ballot totals\n",
    "# before 2016 in these precincts with multiple pages \n",
    "# prior to 2016 each page was counted as 1 ballot\n",
    "# leading to well over 100% turnout which I don't\n",
    "# think was true in reality.\n",
    "\n",
    "import pandas as pd\n",
    "import glob as glob"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "metadata": {},
   "outputs": [],
   "source": [
    "files = glob.glob('./data/raw/*.xls')\n",
    "\n",
    "rename = {'City/Town':'Precinct Name', 'Precinct': 'Precinct Name', 'Election Day': 'E Day', \n",
    "          'Mail Ballots': 'Mail', 'Contest': 'Office Title', 'Contest Title': 'Office Title', \n",
    "          'Candidate Name': 'Candidate', 'Precinct No.': 'Precinct #'}\n",
    "\n",
    "cols = ['Precinct Name', 'Precinct #', 'Total', 'E Day', 'Mail', 'Office Title']"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 11,
   "metadata": {},
   "outputs": [],
   "source": [
    "contest_frame = []\n",
    "turnout_frame = []\n",
    "\n",
    "for f in files:\n",
    "    df = pd.read_excel(f, converters={'Precinct #': '{:0>4}'.format})\n",
    "    df = df.rename(columns=rename)\n",
    "    df = df[cols]\n",
    "    \n",
    "    # cleaning data\n",
    "\n",
    "    df['Precinct Name'] = df['Precinct Name'].str.strip()\n",
    "    \n",
    "    df = df[~df['Precinct Name'].str.contains('Limited')]\n",
    "    df = df[~df['Precinct Name'].str.contains('Federal')]\n",
    "    df = df[~df['Precinct Name'].str.contains('President')]\n",
    "    \n",
    "    df = df[~df['Office Title'].str.contains('Page')]\n",
    "\n",
    "    # registered voters by precinct\n",
    "\n",
    "    registered_voters = df[df['Office Title'] == 'REGISTERED VOTERS - TOTAL']\n",
    "\n",
    "    columns = ['E Day', 'Mail', 'Office Title']\n",
    "\n",
    "    registered_voters = registered_voters.drop(columns=columns)\n",
    "    registered_voters = registered_voters.rename(columns = {'Total': 'registered_voters'})\n",
    "    registered_voters = registered_voters.reset_index(drop=True)\n",
    "\n",
    "    # ballots cast by precinct\n",
    "\n",
    "    ballots_cast = df[df['Office Title'] == 'BALLOTS CAST - TOTAL']\n",
    "\n",
    "    columns = ['E Day', 'Mail', 'Office Title']\n",
    "\n",
    "    ballots_cast = ballots_cast.drop(columns=columns)\n",
    "    ballots_cast = ballots_cast.rename(columns = {'Total': 'ballots_cast'})\n",
    "    ballots_cast = ballots_cast.reset_index(drop=True)\n",
    "    \n",
    "    # mail in voters by precinct\n",
    "\n",
    "    mail_in = df[df['Office Title'] == 'BALLOTS CAST - TOTAL']\n",
    "\n",
    "    columns = ['E Day', 'Total', 'Office Title']\n",
    "\n",
    "    mail_in = mail_in.drop(columns=columns)\n",
    "    mail_in = mail_in.rename(columns = {'Mail': 'mail_in_ballots'})\n",
    "    mail_in = mail_in.reset_index(drop=True)\n",
    "\n",
    "    # merging the 2 datasets\n",
    "\n",
    "    voter_table = registered_voters.merge(ballots_cast)\n",
    "    voter_table = voter_table.merge(mail_in)\n",
    "\n",
    "    # getting total votes by precinct\n",
    "\n",
    "    contest_votes = df.groupby(['Office Title', 'Precinct Name'])['Total'].sum()\n",
    "    contest_votes = pd.DataFrame(contest_votes)\n",
    "    contest_votes = contest_votes.reset_index()\n",
    "\n",
    "    # combining all datasets and getting turnout\n",
    "\n",
    "    contest_votes = contest_votes.merge(voter_table, how='left', on='Precinct Name')\n",
    "    contest_votes = contest_votes.groupby(['Office Title'])['registered_voters', 'ballots_cast', 'mail_in_ballots'].sum()\n",
    "    contest_votes['turnout'] = contest_votes['ballots_cast']/contest_votes['registered_voters']\n",
    "    \n",
    "    voter_table['turnout'] = voter_table['ballots_cast']/voter_table['registered_voters']\n",
    "    voter_table['percent_mail'] = voter_table['mail_in_ballots']/voter_table['ballots_cast']\n",
    "    \n",
    "    # adding tag of year/cycle\n",
    "    \n",
    "    contest_votes['election_type_year'] = f[7:-4]\n",
    "    voter_table['election_type_year'] = f[7:-4]\n",
    "    \n",
    "    # adding looped cleaned data to frame lists\n",
    "    \n",
    "    contest_frame.append(contest_votes)\n",
    "    turnout_frame.append(voter_table)\n",
    "    \n",
    "    \n",
    "\n",
    "contest_frame = pd.concat(contest_frame, sort=False)\n",
    "turnout_frame = pd.concat(turnout_frame, sort=False)\n",
    "\n",
    "turnout_frame.to_csv('./data/clean/precinct_turnout.csv', index=False)\n",
    "contest_frame.to_csv('./data/clean/contest_turnout.csv', index=False)"
   ]
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