Posts Tagged ‘ Methods/Statistics ’

"Statistically Insignificant" or "Non-Statistically Significant"

October 9, 2014
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I use the phrases "statistical insignificance" and "statistically insignificant" often, but I was recently informed that these terms are not correct. Instead, I was told to say something like "non-statistically significant." In light of this, I'm careful to say "not statistically significance" or "a lack of statistical significance" in my forthcoming AJPS article. Since then, though, […]

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Some Initial Observations on Replications as Class Projects

October 2, 2014
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I taught the graduate course in linear models at UB last semester and a major portion of the course was a replication project. Here are a few quick observations. Building the course around a replication project has made organizing the course a lot easier. After all, my ultimate goal at the end of the semester is that […]

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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-5474e5a45837b378266858-i/]  that helps create nice-looking plots in R and it is now up on CRAN. You can get it by typing [crayon-5474e5a4583a7871507758/] directly into the command line in R. See how it works by typing [crayon-5474e5a4583b1183286347-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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