Dear friends. I have some numbers in percentages all very close together between 60% and 80% as a repeated measures design, 6 measurements per patient (11 ptt) all on to treatments. I think it might be possible to make arc since transformation to obtain more well behaved values but is that in general the best ? At any rate there is a dramatic difference between the verdict obtained using pairwise.wilcox.test as compared to t.test. So far this is not a R specific question - but I guess it will be. Best wishes Troels -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._