[R] how to make this qq plot in lattice and/or ggplot2
juliet.hannah at gmail.com
Sun Feb 8 04:25:54 CET 2009
Here is some data.
p <- runif(1000) # sample data
groups <- rep(c(1,2),each=500) #conditioning variable
mydata <- cbind(p,groups)
n <- length(p)
u <- (1:n)/(n + 1) # uniform distribution reference for qqplot
logp <- -log(p,base=10)
logu <- -log(u,base=10)
How can I make the above qqplot in lattice and/or ggplot2. The sample
is uniform, and I take -log10. In addition, I would like to use
the group variable to condition. I was not able to get the stat_qq
function in ggplot2 to work.
Thanks for your time.
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