Added new files resulting from directory restructuring.

[pspp-builds.git] / src / math / group.h

diff --git a/src/math/group.h b/src/math/group.h
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+++ b/src/math/group.h
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+/* PSPP - computes sample statistics.
+   Copyright (C) 2004 Free Software Foundation, Inc.
+   Written by John Darrington <john@darrington.wattle.id.au>
+
+   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. */
+
+
+#ifndef GROUP_H
+#define GROUP_H
+
+
+#include "value.h"
+
+
+/* Statistics for grouped data */
+struct group_statistics
+  {
+    /* The value of the independent variable for this group */
+    union value id;
+
+    /* The arithmetic mean */
+    double mean;
+
+    /* Population std. deviation */
+    double std_dev;
+
+    /* Sample std. deviation */
+    double s_std_dev;
+    
+    /* count */
+    double n;
+
+    double sum;
+
+    /* Sum of squares */
+    double ssq;
+
+    /* Std Err of Mean */
+    double se_mean;
+
+    /* Sum of differences */
+    double sum_diff;
+
+    /* Mean of differences */
+    double mean_diff ;
+
+    /* Running total of the Levene for this group */
+    double lz_total;
+    
+    /* Group mean of Levene */
+    double lz_mean; 
+
+
+    /* min and max values */
+    double minimum ; 
+    double maximum ;
+
+
+  };
+
+
+
+
+/* These funcs are useful for hash tables */
+
+/* Return -1 if the id of a is less than b; +1 if greater than and 
+   0 if equal */
+int  compare_group(const struct group_statistics *a, 
+                  const struct group_statistics *b, 
+                  int width);
+
+unsigned hash_group(const struct group_statistics *g, int width);
+
+void  free_group(struct group_statistics *v, void *aux);
+
+
+
+#endif