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RE: Extinction



 From:  Stan Friesen[SMTP:swf@ElSegundoCA.NCR.COM]
...

>Applying the hypergeometric with N = 40, M = 36, X = 19
>what do we we get?

Prob = 0.525

>Combined with the above high rate groups (and still excluding
>the sharks and rays) we get 65 species, and 74% extinction.
>[N = 65, M = 47, X = 19].  

Prob = 0.000566

>In the hypergemoteric, this would be N=101, M=50, X=19

Prob = 0.0000000428

As you can see, there is a critical dependence on what group over which
you select.  

Nathan