[R-sig-eco] Dissimilarity ranking

[Steve_Friedman at nps.gov]

Burak

You should explore the use of non-metric multidimensional scaling.

?cmdscale

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"                                              
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                                       [R-sig-eco] Dissimilarity ranking   
             11/23/2010 03:09                                              
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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


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