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[pspp-builds.git] / src / math / trimmed-mean.h

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+/* PSPP - a program for statistical analysis.
+   Copyright (C) 2008 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 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, see <http://www.gnu.org/licenses/>. */
+
+#ifndef __TRIMMED_MEAN_H__
+#define __TRIMMED_MEAN_H__
+
+#include <stddef.h>
+
+#include "order-stats.h"
+
+
+struct trimmed_mean
+{
+  struct order_stats parent;
+
+  /* The partial sum */
+  double sum;
+
+  /* The product of c_{k_1+1} and y_{k_1 + 1} */
+  double cyk1p1;
+
+  double w;
+  double tail;
+};
+
+struct statistic * trimmed_mean_create (double W, double c_min);
+double trimmed_mean_calculate (const struct trimmed_mean *);
+
+#endif