It sounds to me as though using PERMANOVA may be preferable. See, for example, https://doi.org/10.1002/9781118445112.stat07841 <https://doi.org/10.1002/9781118445112.stat07841>. The R package, vegan, can implement this technique. R: Permutational Multivariate Analysis of Variance Using Distance ...cc.oulu.fi/~jarioksa/softhelp/vegan/html/adonis.html <https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=2ahUKEwjSrbrKw_DgAhWFtZ4KHd8xBuMQFjAAegQIChAB&url=http%3A%2F%2Fcc.oulu.fi%2F~jarioksa%2Fsofthelp%2Fvegan%2Fhtml%2Fadonis.html&usg=AOvVaw1iRL1qmIXZ3jRobbXfkvyk>
Peter Nelson, PhD Institute of Marine Sciences University of California, Santa Cruz Center for Ocean Health, Long Marine Lab 115 McAllistair Way Santa Cruz, CA, 95076, USA 707-267-5896 > On Mar 7, 2019, at 3:00 AM, r-sig-ecology-requ...@r-project.org wrote: > > Message: 1 > Date: Wed, 6 Mar 2019 15:50:26 +0100 > From: Attila Lengyel <lengyel...@gmail.com <mailto:lengyel...@gmail.com>> > To: "r-sig-ecology@r-project.org <mailto:r-sig-ecology@r-project.org>" > <r-sig-ecology@r-project.org <mailto:r-sig-ecology@r-project.org>> > Subject: [R-sig-eco] MRPP or alike function on non-metric > dissimilarity matrix > Message-ID: > <CALMWnNi=t9D5sPCQ==5kynphtno8dm62cfur_cz5woacobc...@mail.gmail.com > <mailto:CALMWnNi=t9D5sPCQ==5kynphtno8dm62cfur_cz5woacobc...@mail.gmail.com>> > Content-Type: text/plain; charset="utf-8" > > Dear All, > > I would like to test the separation of groups of observations based on a > dissimilarity matrix but the dissimilarity matrix is strongly non-metric. I > thought of MRPP (multi-response permutation procedure) but I don't know if > it requires (semi-)metric dissimilarity matrix or not. Could you recommend > a better solution? > I would appreciate your help. > Best regards, > > Attila > > [[alternative HTML version deleted]] > > > > > ------------------------------ > > Subject: Digest Footer > > _______________________________________________ > R-sig-ecology mailing list > R-sig-ecology@r-project.org <mailto:R-sig-ecology@r-project.org> > https://stat.ethz.ch/mailman/listinfo/r-sig-ecology > <https://stat.ethz.ch/mailman/listinfo/r-sig-ecology> [[alternative HTML version deleted]] _______________________________________________ R-sig-ecology mailing list R-sig-ecology@r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-ecology
