On 08/16/07 12:50, Jiong Zhang, PhD wrote: > Hi All, > > Can somebody tell me how to use R to combine p values using Fisher's method? > thanks.
This might get you started. It is for the sole purpose of combining two two-tailed p-values for effects in the same direction. Thus, it is not very general. I think it gives a one-tailed result. Better check it. combine <- function(x,y) return(pchisq(-2*log(x/2)-2*log(y/2),4,low=F)) -- Jonathan Baron, Professor of Psychology, University of Pennsylvania Home page: http://www.sas.upenn.edu/~baron ______________________________________________ R-help@stat.math.ethz.ch 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.
