Hi,

I am using this function to perform two sample row t-tests on a matrix:

rowttests(mat, fac)

I'm just wondering how the function decides which factor is on which side of
the t-tests. From what I can see it's based on the order of the factors in
levels(fac).

So if levels(fac) is [1] "HER-" "HER+", the function will do a HER-/HER+
t-test? And positive t-stat indicates a higher mean value in "HER-" (the
first) group?

It may sound a stupid question but I'm getting results that completely
contradict somebody else and I'd like to be 100% sure how the function
decides this before I go causing trouble!

Paul.


-- 
Paul Geeleher
School of Mathematics, Statistics and Applied Mathematics
National University of Ireland
Galway
Ireland

	[[alternative HTML version deleted]]

