Thank you! Here is my adapted script:
>lapply(Dataset[3:17], function(x) wilcox.test(x ~ X2, alternative="two.sided", data=Dataset, subset = X2 <= 2)) but in R I have nothing, and in R Commander I have this error message: ERROR: grouping factor must have exactly 2 levels My grouping factor is in X2 column and there are only two levels (m and f). Where is the problem? Iu. Malai Iurie Malai wrote: > > Hi, > > I have a data set: > >> Dataset > X1 X2 X3 X4 X5 X6 X7 X8 X9 X10 X11 X12 X13 X14 X15 X16 X17 > 1 user1 m 22 19 28 24 12 18 9 7 4 5 4 7 5 7 9 > 2 user2 f 25 19 23 18 18 15 6 8 6 6 7 10 7 7 7 > 3 user3 f 28 21 24 18 15 12 10 6 7 9 5 10 5 9 5 > 4 user4 f 26 19 26 21 12 18 6 6 5 1 3 8 6 5 6 > 5 user5 m 21 22 26 18 9 6 4 6 1 7 2 4 4 6 4 > 6 user6 m 24 8 25 12 18 12 7 8 4 1 4 6 7 5 6 > ............................................................... > 71 user71 m 18 4 10 6 3 6 9 5 10 8 4 5 6 5 5 > > I can apply the Wilcoxon test on each column one by one, but how to do > this on the hole table at once? > >> wilcox.test(X3 ~ X2, alternative="two.sided", data=Dataset) > > Wilcoxon rank sum test with continuity correction > > data: X3 by X2 > W = 439, p-value = 0.1291 > alternative hypothesis: true location shift is not equal to 0 > >> > > I researched on this, but I can't find a solution. > I would really appreciate any help. > > P.S. Excuse my lack of terminology :). > > Iurie Malai > Moldova Pedagogical State University > -- View this message in context: http://www.nabble.com/How-to-apply-the-Wilcoxon-test-to-a-hole-table-at-once--tp26030572p26036261.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org 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.