+++ /dev/null
-/* cdf/negbinom.c
- *
- * Copyright (C) 2004 Free Software Foundation, Inc.
- *
- *
- * 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 of the License, 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 program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
- */
-
-
-#include <math.h>
-#include <gsl/gsl_math.h>
-#include <gsl/gsl_errno.h>
-#include <gsl/gsl_cdf.h>
-#include "gsl-extras.h"
-
-/*
- * Pr(X <= n) for a negative binomial random variable X, i.e.,
- * the probability of n or fewer failuers before success k.
- */
-double
-gslextras_cdf_negative_binomial_P(const long n, const long k, const double p)
-{
- double P;
- double a;
- double b;
-
- if(p > 1.0 || p < 0.0)
- {
- GSLEXTRAS_CDF_ERROR("p < 0 or p > 1",GSL_EDOM);
- }
- if ( k < 0 )
- {
- GSLEXTRAS_CDF_ERROR ("k < 0",GSL_EDOM);
- }
- if ( n < 0 )
- {
- P = 0.0;
- }
- else
- {
- a = (double) k;
- b = (double) n+1;
- P = gsl_cdf_beta_P(p, a, b);
- }
-
- return P;
-}
-/*
- * Pr ( X > n ).
- */
-double
-gslextras_cdf_negative_binomial_Q(const long n, const long k, const double p)
-{
- double P;
- double a;
- double b;
-
- if(p > 1.0 || p < 0.0)
- {
- GSLEXTRAS_CDF_ERROR("p < 0 or p > 1",GSL_EDOM);
- }
- if ( k < 0 )
- {
- GSLEXTRAS_CDF_ERROR ("k < 0",GSL_EDOM);
- }
- if ( n < 0 )
- {
- P = 1.0;
- }
- else
- {
- a = (double) k;
- b = (double) n+1;
- P = gsl_cdf_beta_Q(p, a, b);
- }
-
- return P;
-}
-