Hi Conny, AFAIK NMDS is *non-metric* and represents distances among objects, not gradients along axes (known or unknown): distances along axes are stretched as needed locally (NMDS works with rank order), even order of the elements along axes does not tell anything. NMDS is great if you want to say: Object A resembles object C more than it resembles object B, even though C and B are quite similar. Try this: run NMDS several times, aim for different number of axes (e.g. 1,2,3,5,10) and note the scores of the objects along the first one. You *may* get the same thing.
If you need scores of the objects in the ordination, use something with well defined metrics and axes, e.g. PCA, CA. HTH, Martin On 9.1.2016 05:41, Conny wrote: > Hi all, > > > > it has been frequently pointed out in this group, that NMDS axes scores > shouldn't be used individually for further analysis. > > I therefore would like to include both of my NMDS site scores as a response > into a GLM model simultaneously. Unfortunately, I couldn't find any advice > on how to actually do this. I found a couple of papers using NMDS scores in > GLMs, but they all seem to use them individually, fitting separate models to > each of the ordination axes. > > > > I'm a bit at a loss here and any advice is very much appreciated, > > Conny > > > [[alternative HTML version deleted]] > > _______________________________________________ > R-sig-ecology mailing list > R-sig-ecology@r-project.org > https://stat.ethz.ch/mailman/listinfo/r-sig-ecology -- ------------------------------ Pokud je tento e-mail součástí obchodního jednání, Přírodovědecká fakulta Univerzity Karlovy v Praze: a) si vyhrazuje právo jednání kdykoliv ukončit a to i bez uvedení důvodu, b) stanovuje, že smlouva musí mít písemnou formu, c) vylučuje přijetí nabídky s dodatkem či odchylkou, d) stanovuje, že smlouva je uzavřena teprve výslovným dosažením shody na všech náležitostech smlouvy. _______________________________________________ R-sig-ecology mailing list R-sig-ecology@r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-ecology
