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- /* statistics/p_variance_source.c
- *
- * Copyright (C) 1996, 1997, 1998, 1999, 2000, 2007 Jim Davies, Brian Gough
- *
- * 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 3 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.
- */
- double
- FUNCTION(gsl_stats,pvariance) (const BASE data1[],
- const size_t stride1, const size_t n1,
- const BASE data2[],
- const size_t stride2, const size_t n2)
- {
- /* Find the pooled variance of two datasets */
- const double var1 = FUNCTION(gsl_stats,variance) (data1, stride1, n1);
- const double var2 = FUNCTION(gsl_stats,variance) (data2, stride2, n2);
- /* calculate the pooled variance */
- const double pooled_variance =
- (((n1 - 1) * var1) + ((n2 - 1) * var2)) / (n1 + n2 - 2);
- return pooled_variance;
- }
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