2782 search results for "GIS"

Scaling legislative roll call votes with wnominate

December 3, 2012
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Scaling legislative roll call votes with wnominate

We’ve used NOMINATE scaling data before here at is.R(), but today’s Gist shows, in just a few lines of code, how to download up-to-date roll call data and run those votes through Keith Poole (et. al.)’s DW-NOMINATE procedure. It&#82...

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R for Ecologists: Permutation Analysis – t-tests

October 24, 2012
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R for Ecologists: Permutation Analysis – t-tests

You’ve carefully designed your experiment, you’ve meticulously collected your data, and you have a hypothesis to test. Unfortunately, your data is typical of ecology data: small sample sizes, messy, and non-normal. Your ideal test, the t-test, won’t work because of the … Continue reading →

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Logistic Regression with R

October 21, 2012
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Logistic Regression with R

Logistic Regression In my first blog post, I have explained about the what is regression? And how linear regression model is generated in R? In this post, I will explain what is logistic regression? And how the logistic regression model is generated in R? Let’s first understand logistic regression. Logistic regression is one of the

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Federal Register API/R Package Ideas?

September 21, 2012
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The other day Critical Juncture put up an API for the Federal Register. I thought it would be great if there was a package that could use this API to download data directly into R (much like the excellent WDI package). This would make it easier to anal...

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Technical Analysis of Montana Voter Registration Files

September 18, 2012
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Technical Analysis of Montana Voter Registration Files

By Earl F Glynn | Franklin Center This article shows how to analyze Montana voter registration files using R. The Montana Secretary of State sells two files of voter registration records for a fee of $1000: Statewide Voter File Voter History File The Montana Secretary of State provides information about the two files on this

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How to embed a Gist in Tumblr

September 9, 2012
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Here, both for the sake of posterity, as well as example, is an embedded Gist that describes how to embed a Gist in Tumblr: https://gist.github.com/1395926

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Virginia: Comparison of Registered Voter Counts to Census Voting Age Population

August 29, 2012
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Virginia: Comparison of Registered Voter Counts to Census Voting Age Population

By Earl F Glynn | Franklin Center A comparison of US Census voting age population data in Virginia to voter registration data shows only one locality, Surry County, with about 100% of the voting age population registered to vote. Six other localities have about 95% of their voting age population registered:  Craig County, Isle of

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How robust is logistic regression?

August 23, 2012
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How robust is logistic regression?

Logistic Regression is a popular and effective technique for modeling categorical outcomes as a function of both continuous and categorical variables. The question is: how robust is it? Or: how robust are the common implementations? (note: we are using robust in a more standard English sense of performs well for all inputs, not in the Related posts:

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R for Ecologists: Putting Together a Piecewise Regression

August 19, 2012
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R for Ecologists: Putting Together a Piecewise Regression

Piecewise regression comes about when you have ‘breakpoints’, where there are clearly two different linear relationships in the data with a sudden, sharp change in directionality. This crops up occasionally in ecology when dealing with, for example, species richness of understory plants … Continue reading →

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Missouri: Comparison of Registered Voter Counts to Census Voting Age Population

August 13, 2012
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Missouri:  Comparison of Registered Voter Counts to Census Voting Age Population

By Earl F Glynn | Franklin Center A comparison of US Census voting age population data in Missouri to voter registration data shows a number of Missouri counties have bloated voter registration lists. Charts by county for the years 2000 to 2012 show how counties are maintaining their voter lists. Voter fraud potential is higher

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