On 1/12/09 11:12 AM, "Gian Maria Niccolò Benucci" <gian.benu...@gmail.com> wrote:
> Hi Hi there, > > I am trying to use funcion metaMDS (vegan pakage) for Community Ecology > data, but I find no way to calculate the "expressed variance" of the first 2 > axis? is there a way to do that? > Thanks a lot in advance, > Gian, Why nobody asks how to calculate the non-linear stress of PCA or RDA? Non-linear stress would make just as little sense for PCA or RDA as the axis variance makes for NMDS. The axis variance is purely a measure of PCA family of methods (even CA family has a bit different measure), and there is no meaningful way of calculating "expressed variance" for NMDS axes (and indeed, a separate axis is not meaningful for NMDS: it is the configuration spanned by all axes together that makes sense). Cheers, Jari Oksanen _______________________________________________ R-sig-ecology mailing list R-sig-ecology@r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-ecology
