--- /dev/null
+/* 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