Methods

An Improvement to Coefficient Plots

July 3, 2012 | Carlisle Rainey

I recently posted about coefficient plots, discussing my approach and providing some example R code to create the graphs. I had the good fortune of hearing Amanda Driscoll give a talk recently, and she made a small, but really nice … Continue rea... [Read more...]

Coefficient Plots in R

June 30, 2012 | Carlisle Rainey

One popular trend in presenting results is the "coefficient plot," an alternative to the table of regression coefficients. I am seeing this a little more often in political science research and have received a few requests for code, so I … Contin... [Read more...]

Multiply Imputing an Outcome Variable

October 12, 2011 | Carlisle Rainey

Some scholars suggest that multiply imputing an outcome variable is incorrect. I use intuition and simulation to argue that multiply imputing outcomes can drastically improve estimates, even in the case of non-ignorable missingness. Continue reading &#... [Read more...]

R Code for Bow Tie Plots

August 22, 2011 | Carlisle Rainey

Earlier, I discussed the nice properties of bow tie plots for visualizing and understanding inferences from simple randomized treatment experimental designs. R code to quickly create these plots is available here. You can use the command source("htt... [Read more...]

iEvoBio 2011 Synopsis

June 22, 2011 | Scott Chamberlain

We just wrapped up the 2011 iEvoBio meeting. It was awesome! If you didn't go this year or last year, definitely think about going next year.Here is a list of the cool projects that were discussed at the meeting (apologies if I left some out):Vistrails...
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How to fit power laws

June 7, 2011 | Scott Chamberlain

A new paper out in Ecology by Xiao and colleagues (in press, here) compares the use of log-transformation to non-linear regression for analyzing power-laws.They suggest that the error distribution should determine which method performs better. When you...
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Phenotypic selection analysis in R

February 24, 2011 | Scott Chamberlain

I have up to recently always done my phenotypic selection analyses in SAS. I finally got some code I think works to do everything SAS would do. Feedback much appreciated!########################Selection analyses#############################install.pac...
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Quantile regression in R

January 5, 2008 | dataninja

Roger Koenker, a quantile regression crusader, has an R package that implements the procedure. It is called quantreg, and it is documented here. This package has apparently been around for quite some time, but I was only recently turned on to quantile ... [Read more...]

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