/* statistics/p_variance_source.c * * Copyright (C) 1996, 1997, 1998, 1999, 2000 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 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. */ 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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