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st: Fast calculation of a generalized hypergeometric probability


From   "Tiago V. Pereira" <tiago.pereira@incor.usp.br>
To   statalist@hsphsun2.harvard.edu
Subject   st: Fast calculation of a generalized hypergeometric probability
Date   Sun, 3 May 2009 22:57:16 -0300 (BRT)

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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