"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 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
