On 23/11/2012, at 18:44 PM, <aristide.andrianarim...@blueline.mg> <aristide.andrianarim...@blueline.mg> wrote:
> Dear responsible, > > I want to know if ANOSIM (Global R, and p-value) are only use for > dissimilarity matrix as well as similarity matrix > > If I use similarity matrix like Jaccard, is still the same interpretation > of the output R= completely dissimilar and R = 0 completely similar? > Aristide, If your are using the vegan implementation of anosim, the answer is: no, you cannot use anosim() for similarities but only for dissimilarities. If you refer to the *method* (instead of *implementation*), the answer is: yes, of course you can use ANOSIM for similarities. You only need to implement it that way (change the signs, reverse the P-values compared to vegan::anosim()). The vegan implementation is made for R, and R deals with dissimilarities. Some packages may change this R convention, but similarities are not R compliant. Cheers, Jari Oksanen -- Jari Oksanen, Dept Biology, Univ Oulu, 90014 Finland _______________________________________________ R-sig-ecology mailing list R-sig-ecology@r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-ecology
