On 07/08/10 19:25, Knut Krueger wrote: > Hi to all, > is there any function available to combine those p values; > > > Kind Regards Knut
Here's a couple of functions I've used for one thing that you might mean. The idea is that you have two p-values for different tests of the same hypothesis, and you want to get an overall p-value for the hypothesis. The first method, for combining two p-values, was invented by Fisher a very long time ago. The second method I do not remember a thing about, but I found it somewhere. You need to look these up before trusting them. # combine and output one-tailed p's. Enter 2-tailed p's. combine <- function(x,y) return(pchisq(-2*log(x/2)-2*log(y/2),4,low=F)) # Stouffer's method for vector x, gives 2-tailed result pnorm(sum(qnorm(x))/sqrt(length(x))) -- Jonathan Baron, Professor of Psychology, University of Pennsylvania Home page: http://www.sas.upenn.edu/~baron ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
