Using data from the American Community Survey, I analyzed the disparity of male over female veteran and non-veteran median income. Which states have the greatest disparity in income between the sexes? This post begins merely the exploration journey.

The dataset: B21004: MEDIAN INCOME IN THE PAST 12 MONTHS (IN 2015 INFLATION-ADJUSTED DOLLARS) BY VETERAN STATUS BY SEX FOR THE CIVILIAN POPULATION 18 YEARS AND OVER WITH INCOME - Universe: Civilian population 18 years and over with income in the past 12 months, 2015 ACS 5-year estimates

This post will discuss the non-glamorous task of cleaning this Excel file, creating some metrics to calculate percentage difference, plot, and then use the Folium package to create some static chloropleth maps!

Step 1: Cleaning

#Note: I did some light formatting in Excel prior to 
reading in
xls1 = pd.ExcelFile('.../ACS_15_5YR_B21004.xls')

#important to set thousands= ',' to remove the commas
df1 = xls1.parse('Data', thousands=',')
#clean up: drop any column that says "unnamed", just want 
state income only
cols = [c for c in df1.columns if c.lower()[2:8] != 'named:']

#drop the first row that has redundant labels, 'estimate'
df1.drop(df1.index[[0]], inplace=True)

#rename index
new_index = ['total', 'vets', 'male_vets', 'fem_vets', 'nonvets', 'male_nonvets', 'fem_nonvets']

#needed to do a workaround to rename the old index that had duplicative
#index names 'Male:', so I created a new index placeholder, removed the
#old one, and set the index to the new one

df1['new_index'] = new_index
df1.rename(index=str, columns={"index":"old_index"}, inplace=True)
df1.drop('old_index', axis=1, inplace=True)
df1.set_index('new_index', inplace=True)

#convert to floats
df1 = df1.astype(dtype=float, copy=True, raise_on_error=True)
df2 = df1.transpose()

Step 2: Plot for Trends

#clearly see that vets get paid more than nonvets
#female vets and female non vets get paid less overall
sns.set_context("notebook", font_scale=1.0)
plt.figure(figsize=(12, 6))

#also we see that vets get paid more by median income than nonvets and the total population
df2[['vets', 'nonvets', 'total']].plot()

Step 3: By How Much?
At this point we should calculate some metrics to figure out the percentage increase of how much:

  • Veterans get paid more than Non-Veterans
  • Male Veterans get paid more than Female Veterans
  • Male Non-Veterans get paid more than Female Non-Veterans

    Through some basic scatterplots on the earlier dataset, we know that there is a more correlated relationship between males and vets, and males to nonvets, than their female counterparts:

    We can calculate these metrics at the state-level:

    #calculate 3 metrics
    #percentage increase of vets over nonvets median
    df2['vet2nonvet_inc'] = ((df2['vets'] - df2['nonvets']) / 
    #percentage increase of median pay male vets over female vets
    df2['mtf_vetinc'] = ((df2['male_vets'] - df2['fem_vets']) / df2['fem_vets'])*100
    #percentage increase of median nonvet male over nonvet female
    df2['mtf_nonvet_inc'] = ((df2['male_nonvets'] - 
    df2['fem_nonvets']) / df2['fem_nonvets'])*100

    Step 4: Which states are above the mean?
    Here we want to find the U.S. states where our 3 calculated metrics measuring percentage increase, are greater than their respective means using np.where()

    df2['top'] = np.where(((df2['vet2nonvet_inc'] >= 
    df2['vet2nonvet_inc'].mean()) & (df2['mtf_vetinc'] >=df2['mtf_vetinc'].mean()) & (df2['mtf_nonvet_inc'] >=df2['mtf_nonvet_inc'].mean())), 'yes','no')
    #plot these states
    top = df2.loc[(df2['top'] == 'yes')]
    top.set_index('Name', inplace=True)
    top[['total', 'vets', 'nonvets']].plot()

    We see that the percentage disparity of how much veterans get paid more than non-vets, male veterans over female veterans, and male non vets over female vets, is greatest in these six states.

  • Washington
  • Utah
  • Oklahoma
  • Louisiana
  • Alabama
  • West Virginia

    Step 5: Explore all 3 metrics by all states
    Here, we use seaborn to create a dot plot of all the three metrics for all 51 states.

    # Make the PairGrid
    g = sns.PairGrid(df2.sort_values("total", ascending=False),
                 x_vars=df2.columns[-3:], y_vars=["Name"],
                 size=10, aspect=.25)
    # Draw a dot plot using the stripplot function, size=10, orient="h",
      palette="Reds_r", edgecolor="gray")
    # Use the same x axis limits on all columns and add better labels
    g.set(xlim=(0, 100), xlabel="Perc. Inc.", ylabel="")
    # Use semantically meaningful titles for the columns
    titles = ["vet2nonvet_inc", "mtf_vetinc", "mtf_nonvet_inc"]
    for ax, title in zip(g.axes.flat, titles):
      # Set a different title for each axes
      # Make the grid horizontal instead of vertical
    sns.despine(left=True, bottom=True)

    Step 6: Use Folium for U.S. Static Chloropleth Map
    I decided to try out a Python package called Folium to create some static chloropleth maps. First, you need to download FIPS code data to create a merged file with proper USPS state abbreviations.

    #use test to make the first chloropleth
    #prepare two data sets 
    #read in FIPS file and merge
    fips = pd.read_csv("...fipscodes.csv")
    df2.rename(index=str, columns={"index":"Name"}, inplace=True)
    #merge with df2 to get the state abbreviations
    df3 = pd.merge(df2,fips, on="Name", how='left')
    df3.rename(index=str, columns={"USPS_State":"State"}, inplace=True)
    #make three datasets for maps I want to create
    mapdata1 = df3[['State', 'vet2nonvet_inc']].copy()
    mapdata2 = df3[['State', 'mtf_vetinc']].copy()
    mapdata3 = df3[['State', 'mtf_nonvet_inc']].copy()
    #export each to csv 

    Step 7: Create 3 Maps
    Now, we map the 3 metrics we calculated earlier that show the percentage difference (increase) between the sexes and for veterans and non-veterans. The purpose here is to show measures of disparity. It was also pretty interesting to see that our nation's veterans have a greater median income than the non-veterans.

    #You need to download the us-states.json file from 
    state_geo = r'.../us-states.json'
    state_mapdata1 = r'.../mapdata1.csv'
    state_data = pd.read_csv(state_mapdata1)
    #Let Folium determine the scale
    map_1 = folium.Map(location=[48, -102], zoom_start=3)
    map_1.choropleth(geo_path=state_geo, data=state_data,
             columns=['State', 'vet2nonvet_inc'],
             fill_color='YlGn', fill_opacity=0.7, 
             legend_name='vet2nonvet_inc (%)')'us_states_vet2nonvet.html')

    We can see that in New Mexico, Alabama, and Virginia, our U.S. veterans get paid more than non-veterans.

    #map 2
    state_mapdata2 = r'.../mapdata2.csv'
    state_data2 = pd.read_csv(state_mapdata2)
    #Let Folium determine the scale
    map_2 = folium.Map(location=[48, -102], zoom_start=3)
    map_2.choropleth(geo_path=state_geo, data=state_data2,
             columns=['State', 'mtf_vetinc'],
             fill_color='PuBuGn', fill_opacity=0.7, line_opacity=0.2,
             legend_name='mtf_vetinc (%)')'us_states_mtf_vets.html')

    Here we can see that states in the upper mid to northwest like Montana, Utah, Idaho, Wyoming and North Dakota have a greater disparity between Male Veteran median salaries and Female Veteran median salaries.

    #map 3
    state_mapdata3 = r'.../mapdata3.csv'
    state_data3 = pd.read_csv(state_mapdata3)
    #Let Folium determine the scale
    map_3 = folium.Map(location=[48, -102], zoom_start=3)
    map_3.choropleth(geo_path=state_geo, data=state_data3,
             columns=['State', 'mtf_nonvet_inc'],
             fill_color='YlOrRd', fill_opacity=0.7, line_opacity=0.2,
             legend_name='vet2nonvet_inc (%)')'us_states_mtf_nonvets.html')

    Here, we can see that Wyoming and Utah have a greater gap between the median income of Non-Veteran Male salaries compared to Non-Veteran Female salaries in 2015.

    Full script here: