1 /* PSPP - a program for statistical analysis.
2 Copyright (C) 2008, 2009 Free Software Foundation, Inc.
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation, either version 3 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <http://www.gnu.org/licenses/>. */
20 #include <gsl/gsl_cdf.h>
24 #include <data/case.h>
25 #include <data/casewriter.h>
26 #include <libpspp/compiler.h>
27 #include <libpspp/misc.h>
28 #include <math/moments.h>
33 destroy (struct statistic *stat)
35 struct order_stats *os = (struct order_stats *) stat;
41 acc (struct statistic *s, const struct ccase *cx UNUSED,
42 double c, double cc, double y)
45 struct np *np = (struct np *) s;
46 double rank = np->prev_cc + (c + 1) / 2.0;
48 double ns = gsl_cdf_ugaussian_Pinv (rank / ( np->n + 1 ));
50 double z = (y - np->mean) / np->stddev;
54 maximize (&np->ns_max, ns);
55 minimize (&np->ns_min, ns);
57 maximize (&np->dns_max, dns);
58 minimize (&np->dns_min, dns);
60 maximize (&np->y_max, y);
61 minimize (&np->y_min, y);
63 cp = case_create (casewriter_get_proto (np->writer));
64 case_data_rw_idx (cp, NP_IDX_Y)->f = y;
65 case_data_rw_idx (cp, NP_IDX_NS)->f = ns;
66 case_data_rw_idx (cp, NP_IDX_DNS)->f = dns;
67 casewriter_write (np->writer, cp);
73 np_create (const struct moments1 *m)
76 struct np *np = xzalloc (sizeof (*np));
77 struct statistic *stat = (struct statistic *) np;
78 struct order_stats *os = (struct order_stats *) np;
79 struct caseproto *proto;
84 moments1_calculate (m, &np->n, &np->mean, &variance, NULL, NULL);
86 np->stddev = sqrt (variance);
88 np->y_min = np->ns_min = np->dns_min = DBL_MAX;
89 np->y_max = np->ns_max = np->dns_max = -DBL_MAX;
91 proto = caseproto_create ();
92 for (i = 0; i < n_NP_IDX; i++)
93 proto = caseproto_add_width (proto, 0);
94 np->writer = autopaging_writer_create (proto);
95 caseproto_unref (proto);
98 stat->destroy = destroy;
99 stat->accumulate = acc;