On Mon, Nov 21, 2011 at 11:36 AM, Hao, Zhaozhe <haozhao...@ou.edu> wrote: > Hello! > > I need to use Kruskal-Wallis test and post-hoc test (Dunn's test) for my > data. But when I searched around, I only found this function: kruskal.test. > But nothing for Dunn's test. > > So I started to write one myself. But I do not know how to count ties in > the data frame. I can use for loops but it seems long and unnecessary since > the rank function actually knows the ties. So can anyone give me a hint on > how I can "count" the number of ties? >
If you just need the overall number of ties in a vector (say x), you can get it by nTies = length(x) - length(unique(x)) This will not work if missing data are present, so you will have to remove those first. HTH, Peter ______________________________________________ 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.
