vegan::vegdist() function **has** Chao-Jaccard index (method = “chao”). In addition, vegan has function chaodist that is similar to designdist(), but uses the Chao terms (U, V) allowing you to define any Chao distance (see ?chaodist for examples).
Vegan has these choices, but I don’t endorse them: it’s all up to your responsibility. cheers, Jari Oksanen > On 14 Oct 2018, at 19:07 pm, Irene Adamo <i.adam...@gmail.com> wrote: > > Dear all, > I would like to create a distance matrix based on the similarity > Chao-Jaccard index based on raw abundances in R but so far I have not been > able to find a package that does it. The Vegan package does not have this > option and the dis.chao function of CommEcol creates a dissimilarity > matrix. I hope that you can help find a solution. > > thanks in advance! > Irene Adamo > > [[alternative HTML version deleted]] > > _______________________________________________ > R-sig-ecology mailing list > R-sig-ecology@r-project.org > https://stat.ethz.ch/mailman/listinfo/r-sig-ecology _______________________________________________ R-sig-ecology mailing list R-sig-ecology@r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-ecology
