Re: [R] problem about t test

You could do the following: y <- apply(dat,1,function(a) t.test(a[1:10],a[11:30])$p.value) This will produce an array of 2 p-values. --- On Fri, 14/8/09, Gina Liao wrote: > From: Gina Liao > Subject: [R] problem about t test > To: r-h...@stat.math.ethz.ch > Received: Fr

[R] problem about t test

Hello, I have a data frame >str(dat)'data.frame': 2 obs. of 30 variables it contains two information-two types of cancers:stage A(A1 to A10) and stage B(B1 to B20) ##totally 30 patients-2 sets of gene expression I'd like to find the lists for top 20 differentially expressed genes using