Blog Archives

The Front-End of Methods Training

September 18, 2014
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Based on my own experience and interactions with other professors and students, most methods training in political science starts with a “baby stats” course, continues into a more detailed course on linear models, and finishes with a fairly rigorous course on the generalized linear model that includes a grab bag of the latest and greatest […]

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Is OLS BLUE or JUNK?

September 4, 2014
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My favorite pontificators in political science is Fernando Martel Garcia. I got to know him at replication panel ISA, where he quite vigorously opposed the APSR's policy of auto-rejecting replication papers. Fernando recently posted this gem to the PolMeth mailing list. In the real world computers do not work alone but at the behest of […]

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Another Benefit of Publicly Version-Controlled Research

June 4, 2014
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I've been thinking quite a bit lately about why and how political scientists should publicly version control their research projects. By research projects, I mean data, manuscript, and code. And by publicly version control, I mean use Git to version-control and post a public GitHub repository, from the beginning of the project, so that other […]

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More on Product Terms and Interaction in Logistic Regression Models

February 20, 2014
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I noticed that Bill Berry, Justin Esarey, and Jackie DeMeritt's (BDE) long-time R&R'ed paper at AJPS is finally forthcoming. I really like seeing highly applied, but rigorous, work like this being published at top journals. You should definitely have a look at their paper if you use logit or probit models to argue for interaction. […]

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Creating Marginal Effect Plots for Linear Regression Models in R

August 27, 2013
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Creating Marginal Effect Plots for Linear Regression Models in R

I discuss how to use R to create marginal effect plots as a part of evaluating interactive theories as suggested by Brambor, Clark, and Golder (2006).

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compactr is now on CRAN

August 5, 2013
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compactr is now on CRAN

I've been working on a package called [crayon-5425d0ec01fb1049086532-i/]  that helps create nice-looking plots in R and it is now up on CRAN. You can get it by typing [crayon-5425d0ec01fc4534510070/] directly into the command line in R. See how it works by typing [crayon-5425d0ec01fcc986660288-i/]  or reading the details here. Below I describe the basic structure and functions. […]

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Arguing for Negligible Effects

July 23, 2013
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I just uploaded a newer version of my re-titled paper "Arguing for a Negligible Effect." You can find the latest version here. It has a "revise and resubmit" at AJPS and I'm sending it back on August 15 (when they re-open after the summer break), so I'd certainly appreciate any suggestions. The abstract is below: Political […]

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Testing for Interaction in Logit Models

July 11, 2013
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Testing for Interaction in Logit Models

Andrew Gelman recently posted about testing for interaction in logistic regression models. This is something I've read and thought a little about, so I'm linking to several articles on the topic and offering my quick take. The Debate in Political Science As far as I can tell, the debate started in political science when Wolfinger […]

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More on What Can Be Learned from Statistical Significance

July 8, 2013
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More on What Can Be Learned from Statistical Significance

A while back, I reacted to a post by Justin Esarey, in which he argues that not much can be learned from statistical significance. The basic question he's asking is as follows: For a fixed sample size, what does the posterior probability of the null hypothesis look like if we update based on the result of […]

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Preemptive Review Comments

February 14, 2013
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I link to and briefly discuss the paper "Rookie Mistakes," recently published in PS.

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