X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;ds=inline;f=src%2Fmath%2Fmoments.c;h=83cbbe4ca1fb3e4c2d4e2a6497ed84ced68b0c31;hb=8fee80becb97ba397876d1917dcac04904f16630;hp=2934dd7ad5a547807b7395af925def288f83cb28;hpb=43b1296aafe7582e7dbe6c2b6a8b478d7d9b0fcf;p=pspp
diff --git a/src/math/moments.c b/src/math/moments.c
index 2934dd7ad5..83cbbe4ca1 100644
--- a/src/math/moments.c
+++ b/src/math/moments.c
@@ -1,5 +1,5 @@
/* PSPP - a program for statistical analysis.
- Copyright (C) 1997-9, 2000 Free Software Foundation, Inc.
+ Copyright (C) 1997-9, 2000, 2010, 2011 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
@@ -15,13 +15,18 @@
along with this program. If not, see . */
#include
-#include "moments.h"
+
+#include "math/moments.h"
+
#include
#include
#include
-#include
-#include
-#include
+
+#include "data/val-type.h"
+#include "data/value.h"
+#include "libpspp/misc.h"
+
+#include "gl/xalloc.h"
#include "gettext.h"
#define _(msgid) gettext (msgid)
@@ -47,13 +52,13 @@ calc_moments (enum moment max_moment,
/* From _SPSS Statistical Algorithms, 2nd ed.,
0-918469-89-9, section "DESCRIPTIVES". */
- if (fabs (*variance) >= 1e-20)
+ if (fabs (s2) >= 1e-20)
{
if (max_moment >= MOMENT_SKEWNESS && skewness != NULL && w > 2.)
{
double s3 = s2 * sqrt (s2);
double g1 = (w * d3) / ((w - 1.0) * (w - 2.0) * s3);
- if (finite (g1))
+ if (isfinite (g1))
*skewness = g1;
}
if (max_moment >= MOMENT_KURTOSIS && kurtosis != NULL && w > 3.)
@@ -61,7 +66,7 @@ calc_moments (enum moment max_moment,
double den = (w - 2.) * (w - 3.) * pow2 (s2);
double g2 = (w * (w + 1) * d4 / (w - 1.) / den
- 3. * pow2 (d2) / den);
- if (finite (g2))
+ if (isfinite (g2))
*kurtosis = g2;
}
}
@@ -456,6 +461,13 @@ moments1_destroy (struct moments1 *m)
free (m);
}
+
+double
+calc_semean (double var, double W)
+{
+ return sqrt (var / W);
+}
+
/* Returns the standard error of the skewness for the given total
weight W.