I see. Thanks for explaining Jari! On Tue, 16 Oct 2018 at 14:54, Jari Oksanen <jari.oksa...@oulu.fi> wrote:
> > > On 16/10/18 11:23, Torsten Hauffe wrote: > > "adonis2(speciesdataset~A*B, by="margin") but then only the effect of > the > > interaction is tested." > > > > This is not entirely correct. > > adonis2(speciesdataset~A:B, by="margin") would test the interaction > alone. > > ~A*B unfolds to ~A+B+A:B > > Well, it was correct: the only **marginal** effect in ~A+B+A:B is A:B (A > and B are not marginal), and by = "margin" will only analyse marginal > effects. > > Cheers, Jari Oksanen > > > > On Tue, 16 Oct 2018 at 11:51, Ellen Pape <ellen.p...@gmail.com> wrote: > > > >> Hi all, > >> > >> I don't know whether this is the correct mailing group to address this > >> question: > >> > >> I would like to perform a 2-way permanova analysis in R (using adonis in > >> vegan). By default you are performing sequential tests (by="terms"), so > >> when you have 2 or more factors, the order of these factors matter. > >> However, since I wanted to circumvent this, I chose for the option > >> by="margin" (adonis2(speciesdataset~A*B, by="margin")) but then only the > >> effect of the interaction is tested. On the "help page" of anova. cca it > >> says: "if you select by="margin" -> the current function only evaluates > >> marginal terms. It will, for instance, ignore main effects that are > >> included in interaction terms." > >> > >> > >> My question now is: can I somehow get the main effects tested anyhow, > when > >> the interaction term is not significant? > >> > >> Thanks, > >> Ellen > >> > >> [[alternative HTML version deleted]] > >> > >> _______________________________________________ > >> R-sig-ecology mailing list > >> R-sig-ecology@r-project.org > >> 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 > > > _______________________________________________ > R-sig-ecology mailing list > R-sig-ecology@r-project.org > 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
