- Dem % Cong: the share of Dem votes for the Cong. candidate
- Dem % Pre: the share of Dem votes for the Pres. candidate
- Voter Turnout + Cong: the relative registered voters who did not vote + (Dem % Cong)
- Voter Turnout + Pres: the relative registered voters who did not vote + (Dem % Pres)
- Voter Turnout * Cong: the relative registered voters who did not vote * (Dem % Cong)
- Voter Turnout * Pres: the relative registered voters who did not vote * (Dem % Pres)
- Relative Dem Cong. Votes: the relative Dem votes cast for Cong. candidate across all precincts Dem and Rep
- Relative Dem Pres. Votes: the relative Dem votes cast for Pres. candidate across all precincts, Dem and Rep
The data in the map is all shaded based on a scale of 0–1, the lighter blue corresponds to a low value, darker blue corresponds to a higher value. Some of the stats represent percentages, others represent metrics to compare the General Election results. The outlined areas are each a voting precinct, and the GIS shapes were taken from the open database provided by the City of Houston. The general election results were taken from the online archive on the Harris County Clerk’s website. The data used to generate the maps was first populated in a Google spreadsheet.
Hovering over a precinct reveals the total votes received by the Democrat candidate for that particular statistic as well as the stat value used to determine the shading. For instance, by hovering over precinct 0881 when “Dem % Cong” is set, the votes Cargas received for that district is displayed along with the share of votes Cargas received, which is the “Dem % Cong.”
“Voter Turnout + Cong” and “Voter Turnout + Pres” are like stacked bar charts. I’ve calculated a metric to rank the voting precincts by the registered voters who did not vote, then the share of votes received by the Democrat candidate is added to that value. To keep the value on a scale of 0 to 1, each sum is divided by 2. Although not as important for the TX-7 effort, dividing by 2 allows this value to be also comparable with other Congressional districts.
Below is a portion of one of the charts available in the Google spreadsheet referred to above. In general, this chart represents the graph form of the “Voter Turnout + Cong” map. Thus, a high number for Voter Turnout + Cong may indicate low voter turnout with a strong Democrat presence, whereas a low number may indicate high voter turn with a weak Democrat presence.
“Relative Dem Cong. Votes” and “Relative Dem Pres Votes” ranks the Democrat turn-out across all the precincts including Democrat turnout and Republican turnout. For instance, precinct 0881 had the highest Democratic turn-out for Cargas providing 2367 votes, but it has a ranking value of less than 1, which means that a Republican precinct beat 0881 based on turnout.