## Copyright (C) 1997 Kurt Hornik ## ## This program is free software; you can redistribute it and/or modify ## it under the terms of the GNU General Public License as published by ## the Free Software Foundation; either version 2, or (at your option) ## any later version. ## ## This program is distributed in the hope that it will be useful, but ## WITHOUT ANY WARRANTY; without even the implied warranty of ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU ## General Public License for more details. ## ## You should have received a copy of the GNU General Public License ## along with this file. If not, write to the Free Software Foundation, ## 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. ## Compute the cumulative distribution function (CDF) at x of the ## hypergeometric distribution with parameters m, t, and n. This is the ## probability of obtaining not more than x marked items when randomly ## drawing a sample of size n without replacement from a population of ## total size t containing m marked items. ## ## The parameters m, t, and n must positive integers with m and n not ## greater than t. ## Author: KH <Kurt.Hornik@ci.tuwien.ac.at> ## Description: CDF of the hypergeometric distribution function cdf = hypergeometric_cdf (x, m, t, n) if (nargin != 4) usage ("hypergeometrix_cdf (x, m, t, n)"); endif if ((m < 0) | (t < 0) | (n <= 0) | (m != round (m)) | (t != round (t)) | (n != round (n)) | (m > t) | (n > t)) cdf = NaN * ones (size (x)) else cdf = discrete_cdf (x, 0 : n, hypergeometric_pdf (0 : n, m, t, n)); endif endfunction

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