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Re: [Bug-gsl] Hypergeometric distribution

From: Jussi Piitulainen
Subject: Re: [Bug-gsl] Hypergeometric distribution
Date: 12 Mar 2004 18:01:05 +0200
User-agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.2

Brian Gough writes:
> Jussi Piitulainen writes:
>> The info page says p(k) = C(n_1,k) C(n_2, t-k) / C(n_1 + n_2,k). It
>> does not tell what the parameters are, but I believe the very last
>> symbol is wrong, and p(k) = C(n_1,k) C(n_2, t-k) / C(n_1 + n_2,t)
>> is meant. It also says the domain of k is
>> max(0,t-n_2),...,max(t,n_1). If "domain" means the possible values,
>> I believe 0,...,min(t,n_1) is better. (No definition is given for
>> C(n_2, t-k) with t < k.)  Also, the documentation mentions an N3
>> where T must be meant.
> Thanks for the bug report.
> I will correct that in the next release.

I have an embarrassing note to add. The lower bound max(0,t-n_2) in
info is correct and my correction to it was wrong.

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