What have you tried so far?
On Thu, Nov 20, 2008 at 7:40 AM, P.Branco <pjlbranco at yahoo.com>
wrote:>
> Dear all,
>
> I was wondering if you could help me with the following.
>
> I want to do calculate this equation:
>
> Ps(t)= (?_(r=1)^N Xtr* 1/?drs)/(?_(r=1)^N 1/?drs)
>
> Ps(t) ? Probability that taxon t will occur at site s (300 sites s)
> N ? Number of sites = from 1 to 49
> Xtr ? Value for taxon t at site r (I have this information in a table, 40
> taxa (columns) t, 49 sites r)
> drs ? Distance from site r to site s (this information is on a table, s
> sites (columns))
>
> I thought that R would be the software to use, but I am experiencing some
> difficulties
>
> Thanks to everyone,
> P.Branco
>
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Stephen Sefick
Research Scientist
Southeastern Natural Sciences Academy
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