[R-sig-eco] adjusting for empty rows in metaMDS

[Eduard Szöcs]

Hai Tracy,

You could also add a dummy-species , see [1].

Eduard

[1] K. Robert Clarke, Paul J. Somerfield, M. Gee Chapman (2006) .
On resemblance measures for ecological studies, including taxonomic 
dissimilarities and a zero-adjusted Bray–Curtis coefficient for denuded 
assemblages. Journal of Experimental Marine Biology and Ecology.
Volume 330. Issue 1


On 25/01/12 22:07, Pinney, Tracy A wrote:
> Hello,
>
>     I am trying to use metaMDS (or isoMDS) for a community data set with 10 species.  However, I have several sites with no species present (empty rows), and this seems to present a problem in the dissimilarity matrix in the form of missing values.  Does anyone have suggestions on how to deal with this?  Is it appropriate to create a dummy variable in the original community matrix?  If so, what is the best way to do this?  Thanks for any help.
>
>
>
> Tracy Pinney
>
>
>
> PhD candidate
>
> Department of Biology
>
> Baylor University
>
> One Bear Place 97388-7388
>
> Waco, TX  76798-7388
>
>
> 	[[alternative HTML version deleted]]
>
> _______________________________________________
> R-sig-ecology mailing list
> R-sig-ecology at r-project.org
> https://stat.ethz.ch/mailman/listinfo/r-sig-ecology
>