Computes Levene test statistic.
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
#include <libpspp/str.h>
#include <data/variable.h>
#include <data/procedure.h>
+#include <data/casefilter.h>
#include <libpspp/alloc.h>
#include <libpspp/misc.h>
#include "group.h"
struct t_test_proc **group_stats;
/* The independent variable */
- struct variable *v_indep;
+ const struct variable *v_indep;
/* Number of dependent variables */
size_t n_dep;
/* The dependent variables */
- struct variable **v_dep;
+ const struct variable **v_dep;
- /* How to treat missing values */
- enum lev_missing missing;
-
- /* Function to test for missing values */
- is_missing_func *is_missing;
+ /* Filter for missing values */
+ struct casefilter *filter;
};
/* First pass */
static void levene_precalc (const struct levene_info *l);
-static int levene_calc (const struct ccase *, void *);
+static int levene_calc (const struct dictionary *dict, const struct ccase *,
+ const struct levene_info *l);
static void levene_postcalc (void *);
/* Second pass */
-static void levene2_precalc (void *);
-static int levene2_calc (const struct ccase *, void *);
+static void levene2_precalc (struct levene_info *l);
+static int levene2_calc (const struct dictionary *, const struct ccase *,
+ struct levene_info *l);
static void levene2_postcalc (void *);
void
-levene(const struct casefile *cf,
- struct variable *v_indep, size_t n_dep, struct variable **v_dep,
- enum lev_missing missing, is_missing_func value_is_missing)
+levene(const struct dictionary *dict,
+ const struct casefile *cf,
+ const struct variable *v_indep, size_t n_dep,
+ const struct variable **v_dep,
+ struct casefilter *filter)
{
struct casereader *r;
struct ccase c;
l.n_dep = n_dep;
l.v_indep = v_indep;
l.v_dep = v_dep;
- l.missing = missing;
- l.is_missing = value_is_missing;
-
+ l.filter = filter;
- levene_precalc(&l);
- for(r = casefile_get_reader (cf);
+ levene_precalc (&l);
+ for(r = casefile_get_reader (cf, filter);
casereader_read (r, &c) ;
case_destroy (&c))
{
- levene_calc(&c,&l);
+ levene_calc (dict, &c, &l);
}
casereader_destroy (r);
- levene_postcalc(&l);
+ levene_postcalc (&l);
levene2_precalc(&l);
- for(r = casefile_get_reader (cf);
+ for(r = casefile_get_reader (cf, filter);
casereader_read (r, &c) ;
case_destroy (&c))
{
- levene2_calc(&c,&l);
+ levene2_calc (dict, &c,&l);
}
casereader_destroy (r);
- levene2_postcalc(&l);
-
+ levene2_postcalc (&l);
}
/* Internal variables used in calculating the Levene statistic */
for(i = 0; i < l->n_dep ; ++i )
{
- struct variable *var = l->v_dep[i];
+ const struct variable *var = l->v_dep[i];
struct group_proc *gp = group_proc_get (var);
struct group_statistics *gs;
struct hsh_iterator hi;
}
static int
-levene_calc (const struct ccase *c, void *_l)
+levene_calc (const struct dictionary *dict, const struct ccase *c,
+ const struct levene_info *l)
{
size_t i;
bool warn = false;
- struct levene_info *l = (struct levene_info *) _l;
- const union value *gv = case_data (c, l->v_indep->fv);
+ const union value *gv = case_data (c, l->v_indep);
struct group_statistics key;
- double weight = dict_get_case_weight (dataset_dict (current_dataset), c, &warn);
-
- /* Skip the entire case if /MISSING=LISTWISE is set */
- if ( l->missing == LEV_LISTWISE )
- {
- for (i = 0; i < l->n_dep; ++i)
- {
- struct variable *v = l->v_dep[i];
- const union value *val = case_data (c, v->fv);
+ double weight = dict_get_case_weight (dict, c, &warn);
- if (l->is_missing (&v->miss, val) )
- {
- return 0;
- }
- }
- }
-
-
key.id = *gv;
for (i = 0; i < l->n_dep; ++i)
{
- struct variable *var = l->v_dep[i];
+ const struct variable *var = l->v_dep[i];
struct group_proc *gp = group_proc_get (var);
double levene_z;
- const union value *v = case_data (c, var->fv);
+ const union value *v = case_data (c, var);
struct group_statistics *gs;
gs = hsh_find(gp->group_hash,(void *) &key );
if ( 0 == gs )
continue ;
- if ( ! l->is_missing(&var->miss, v))
+ if ( ! casefilter_variable_missing (l->filter, c, var))
{
levene_z= fabs(v->f - gs->mean);
lz[i].grand_total += levene_z * weight;
gs->lz_total += levene_z * weight;
}
-
}
return 0;
}
}
+
/* The denominator for the expression for the Levene */
-static double *lz_denominator;
+static double *lz_denominator = 0;
static void
-levene2_precalc (void *_l)
+levene2_precalc (struct levene_info *l)
{
size_t v;
- struct levene_info *l = (struct levene_info *) _l;
-
lz_denominator = xnmalloc (l->n_dep, sizeof *lz_denominator);
/* This stuff could go in the first post calc . . . */
- for (v = 0; v < l->n_dep; ++v)
+ for (v = 0;
+ v < l->n_dep;
+ ++v)
{
struct hsh_iterator hi;
struct group_statistics *g;
- struct variable *var = l->v_dep[v] ;
+ const struct variable *var = l->v_dep[v] ;
struct hsh_table *hash = group_proc_get (var)->group_hash;
}
static int
-levene2_calc (const struct ccase *c, void *_l)
+levene2_calc (const struct dictionary *dict, const struct ccase *c,
+ struct levene_info *l)
{
size_t i;
bool warn = false;
- struct levene_info *l = (struct levene_info *) _l;
-
- double weight = dict_get_case_weight (dataset_dict (current_dataset), c, &warn);
+ double weight = dict_get_case_weight (dict, c, &warn);
- const union value *gv = case_data (c, l->v_indep->fv);
+ const union value *gv = case_data (c, l->v_indep);
struct group_statistics key;
- /* Skip the entire case if /MISSING=LISTWISE is set */
- if ( l->missing == LEV_LISTWISE )
- {
- for (i = 0; i < l->n_dep; ++i)
- {
- struct variable *v = l->v_dep[i];
- const union value *val = case_data (c, v->fv);
-
- if (l->is_missing(&v->miss, val) )
- {
- return 0;
- }
- }
- }
-
key.id = *gv;
for (i = 0; i < l->n_dep; ++i)
{
double levene_z;
- struct variable *var = l->v_dep[i] ;
- const union value *v = case_data (c, var->fv);
+ const struct variable *var = l->v_dep[i] ;
+ const union value *v = case_data (c, var);
struct group_statistics *gs;
gs = hsh_find(group_proc_get (var)->group_hash,(void *) &key );
if ( 0 == gs )
continue;
- if ( ! l->is_missing (&var->miss, v) )
+ if ( ! casefilter_variable_missing (l->filter, c, var))
+
{
levene_z = fabs(v->f - gs->mean);
- lz_denominator[i] += weight * pow2(levene_z - gs->lz_mean);
+ lz_denominator[i] += weight * pow2 (levene_z - gs->lz_mean);
}
}
struct hsh_iterator hi;
struct group_statistics *g;
- struct variable *var = l->v_dep[v] ;
+ const struct variable *var = l->v_dep[v] ;
struct group_proc *gp = group_proc_get (var);
struct hsh_table *hash = gp->group_hash;
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