Re: st: Fast calculation of a generalized hypergeometric probability

[Jeph Herrin <junk@spandrel.net>]

Not very clear on your problem, but have you tried to apply
the function -hypergeometricp- ?



Tiago V. Pereira wrote:
> Dear all,
>
> I have a set of large 2x3 tables and I would like to compute the
> probability of each configuration (given fixed margins).
>
> Using
>
> exp(lnfactorial(k)-lnfactorial(n)-lnfactorial(k-n)) for a combinatorial
> function k out of n works fine for small tables, but overflow for large
> numbers.
>
>
> Since there is a great chance that you know shortcuts for the
> generalized hypergeometric probability, I would appreciate any advice.
>
> All the best,
>
> Tiago
>
>
>
>
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