Impossible to say w/o a reproducible example, but to start with let me suggest looking at the exact= (both functions) and correct= (wilcox.test) arguments. Experience shows that some change of the default settings allows you to reproduce results from other software (and the help pages will explain you what the settings do; by that, you might also learn what your other tools actually calculate if you have no documentation at hand).
HTH, Michael > -----Original Message----- > From: r-help-boun...@r-project.org [mailto:r-help-bounces@r- > project.org] On Behalf Of Alexander Favorov > Sent: Freitag, 1. Februar 2013 09:00 > To: r-help@r-project.org > Subject: [R] ks.test and wilcoxon.test results differ from other > stat.packages > > Probably, it's an obvious info, but I have not found anything in R FAQ > concerning this feature/bug. > > The results of ks.test and wilcoxon.test (in the Mann-Whitney version, > paired = 'FALSE') don't coincide with the results from the other > statistical packages, e.g. Statistica, Medcalc, and (as for MW test) > from the numerous online MW tests. > > E.g. > Statistica p-value=0.0435353 > Medcalc p-value=0.0435354 > R p-value=0.04635 > > If I want to obtain result of test once, it does not matter. > > But what should I do if I want to perform Monte-Carlo simulations and I > need in 10000 or even 100 000 p-values and then will build some > distribution and then use results of Statictica? Whtever, the > descrepancy bothers. > > Are there some alternative packages for non-parametric statistics that > produce results comparable with the other program packages? Or, > probably, there is exists some environment variable to perform > calculations in more common way? > > Thank you! > > Sasha. > > ______________________________________________ > 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. ______________________________________________ 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.
