[EMAIL PROTECTED] writes: > Full_Name: Patrick Hodgson > Version: 2.0 > OS: solaris 2.9 > Submission from: (NULL) (65.94.128.161) > > > The value reported for the parameter W in the function wilcox.exact appears to > be incorrect. I have checked the reference in the help file for this function > (Myles & Hollander 1973, as well as 2nd ed. 1999 by same authors) and it is > clear that W is the sum of the ranks of the data set with the smaller number > of > members.
You should not use the bug repository to report on a (non-core) package. However, it is the same W used by wilcox.test and help(wilcox.test) has the explanation. > Here is sample input/output: > > x<-c(1,2,3,4,5,6,7,8,9,10) > > y<-c(11,12,13,14,15) > > library(exactRankTests) > > wil<-wilcox.exact(x,y) > > wil > > Exact Wilcoxon rank sum test > > data: x and y > W = 0, p-value = 0.000666 > alternative hypothesis: true mu is not equal to 0 > > In this case W should be the sum of the ranks of y (coincidentally also the > values of the y data)= 11+12+13+14+15 = 65. > W of zero is ridiculous. > > Similarly, in this case W should be 2+4+6+8 = 20, not 10 as reported. > > x<-c(1,3,5,7,9) > > y<-c(2,4,6,8) > > wil<-wilcox.exact(x,y) > > wil > > Exact Wilcoxon rank sum test > > data: x and y > W = 10, p-value = 1 > alternative hypothesis: true mu is not equal to 0 > > ______________________________________________ > R-devel@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-devel > -- O__ ---- Peter Dalgaard Øster Farimagsgade 5, Entr.B c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907 ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
