Alberto Gallano asked: > > Would this also be the case in the situation where n is small enough (~ <15) > to enumerate all possible unique permutations? I was under the impression > that such an 'exact' test provided the true p-value without error.
In a case that small, one might be able to evaluate all permutations. (There are 1.3 x 10^12 permutations, but maybe you need combinations, which are fewer). Yes, you would then have an exact P value. But of course that is not the same as an infinitely powerful test -- after all an ordinary t-test gets you an exact P value when its assumptions are met. J.F. ---- Joe Felsenstein j...@gs.washington.edu Department of Genome Sciences and Department of Biology, University of Washington, Box 355065, Seattle, WA 98195-5065 USA _______________________________________________ R-sig-phylo mailing list - R-sig-phylo@r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-phylo Searchable archive at http://www.mail-archive.com/r-sig-phylo@r-project.org/
