Hai Yong,

have a look at the vegan package: with the function vegdist() you can 
calculate dissimilarity indices.
There are also some good tutorials on vegan available on the net.


HTH,

Eduard





Am 28.12.2010 06:53, schrieb Yong Zhang:
> Hello all,
>
> Thing is like that now I have 14 sampling sites with the species and environment data. Which analysis is the best choice for determining the difference/dissimilarity among those sites. I have installed the R (2.12.2 version), which soft package or function should I take to achieve my objective.
>
> Thanks very much for your time and suggestion.
>
> Best Regards
>
> Yong
> 2010-12-28
>
>
>
>
> Yong Zhang, Ph.D.
> Lab of aquatic insects&  stream ecology
> Dept.of Entonology, Nanjing Agricultural University
> Nanjing, 210095,China
> Phone number:  (+86) -25-84395241
> E-mail:2010202035@njau.edu.cn
>
>
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