[R-sig-eco] Dissimilarity ranking
Gavin Simpson
gavin.simpson at ucl.ac.uk
Wed Nov 24 00:48:25 CET 2010
On Tue, 2010-11-23 at 15:43 -0500, Steve_Friedman at nps.gov wrote:
> Burak
>
> You should explore the use of non-metric multidimensional scaling.
>
> ?cmdscale
cmdscale is classical (or metric) multidimensional scaling. nMDS is in
MASS:::isoMDS() or vegan's metaMDS().
G
> Steve Friedman Ph. D.
> Ecologist / Spatial Statistical Analyst
> Everglades and Dry Tortugas National Park
> 950 N Krome Ave (3rd Floor)
> Homestead, Florida 33034
>
> Steve_Friedman at nps.gov
> Office (305) 224 - 4282
> Fax (305) 224 - 4147
>
>
>
> "Pekin, Burak K"
> <bpekin at purdue.ed
> u> To
> Sent by: "'r-sig-ecology at r-project.org'"
> r-sig-ecology-bou <r-sig-ecology at r-project.org>
> nces at r-project.or cc
> g
> Subject
> [R-sig-eco] Dissimilarity ranking
> 11/23/2010 03:09
> PM
>
>
>
>
>
>
>
>
> Hello, I want to rank the dissimilarity of sites based on their species
> composition. For example, I would like to be able to say that site A is
> less similar in composition to the other sites than site B is similar to
> the other sites. I could do a cluster analysis and look at which sites are
> less closely clustered.
>
> It would be even better if I could come up with a quantitative scale rather
> than a relative ranking that would give a value for each site based on its
> relative dissimilarity to the rest of the sites. So site A might receive a
> 90 out of 100, whereas site B and C might receive a 60 and a 50 indicating
> the rank as well as 'relative quantity' of dissimilarity for each site.
>
> Thanks,
> Burak
>
> --------------------------
>
> Burak K. Pekin, PhD
> Postdoctoral Research Associate
> Purdue University
>
>
> [[alternative HTML version deleted]]
>
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