QQ plots of p-values in R using ggplot2

November 9, 2009
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(This article was first published on Getting Genetics Done, and kindly contributed to R-bloggers)

Way back will wrote on this topic.  See his previous post for Stata code for doing this.  Unfortunately the R package that was used to create QQ-plots here has been removed from CRAN, so I wrote my own using ggplot2 and some code I received from Daniel Shriner at NHGRI.Of course you can use R's built-in qqplot() function, but I could never figure out a way to add the diagonal using base

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