Mapping Public Opinion: A Tutorial

2008 CCES Ideological Self-Placement

At the upcoming 2012 summer meeting of the Society of Political Methodology, I will be presenting a poster on Isarithmic Maps of Public Opinion. Since last posting on the topic, I have made major improvements to the code and robustness of the modeling approach, and written a tutorial that illustrates the production of such maps. This … Continue reading

Isarithmic Maps of Public Opinion Data

Isarithmic Thumbnail

As a follow-up to my isarithmic maps of county electoral data, I have attempted to experiment with extending the technique in two ways. First, where the electoral maps are based on data aggregated to the county level, I have sought to generalize the method to accept individual responses for which only zip code data is … Continue reading

Choropleth tutorial and regression coefficient plots

The Deep South, electoral choropleth

About two weeks ago, I gave short talk at Duke, wherein I presented a brief tutorial on creating choropleth maps in R using ggplot2. Since the code is already written, and the data and shapefiles already hosted online, I thought I would share the tutorial more widely. A .ZIP file containing all the files necessary … Continue reading

Electoral Marimekko Plots

2008 County Voting Marimekko

To be reductive, visual displays of quantitative information might be reasonably categorized on a continuum between “data display” and “statistical graphics.” By statistical graphics, I mean a plot that displays some summary of or relationship amongst several variables, likely having undergone some processing or analysis. This may be as simple as a scatterplot of a … Continue reading

Isarithmic History of the Two-Party Vote

1980 Isarithmic Map

A few weeks ago, I shared a series of choropleth maps of U.S. presidential election returns, illustrating the relative support for Democratic, Republican, and third Party candidates since 1920. The granularity of these county level results led me to wonder whether it would be possible to develop an isarithmic map of presidential voting using the … Continue reading

Choropleth Maps of Presidential Voting

1964

Having always appreciated the red and blue cartograms and cartographs of geographic electoral preferences, such as those made available by Mark Newman, I sought to produce similar maps, but include information about support for non-”state-sponsored” parties, and to extend the coverage back in time. I was able to find county-level presidential election returns going as … Continue reading

K-Means Redistricting

NC Cluster Redistricting (feature)

U.S. Congressional districts are today drawn with the aim of maximizing the electoral advantage of the state’s majority party, subject to some constraints, including compactness (which can be measured in numerous ways) and a “one person, one vote” standard. What if, instead of minimizing population variance across districts, we aimed to minimize the mean distance between … Continue reading

Regionalization via network-constrained clustering

Atlantic Coast

I was interested in applications for a clustering algorithm that works along a network, identifying contiguous partitions, and thought that a good place to start would be identifying regional patterns in electoral preferences. This project represents the early products of this inquiry. I chose county-level data, as counties are small enough to make “interesting” regions, … Continue reading

Follow

Get every new post delivered to your Inbox.