Fix test failures on T-TEST command.

The t-test command is documented to ignore cases
which are not in a valid group.
The new levene function does not have any awareness
of the group criteria.  Therefore we must remove any
values which are not in a valid group.

diff --git a/src/language/stats/t-test.q b/src/language/stats/t-test.q
index 77fc429796428a9cab677563cac142995c97f7da..9eb2c471356b2daa7a6e94f7a7174aac1c7cb65f 100644 (file)
--- a/src/language/stats/t-test.q
+++ b/src/language/stats/t-test.q
@@ -1401,6 +1401,23 @@ group_calc (const struct dictionary *dict, struct t_test_proc *proc,
   return 0;
 }
 
+
+static bool
+is_criteria_value (const struct ccase *c, void *aux)
+{
+  const struct t_test_proc *proc = aux;
+  const union value *val = case_data (c, proc->indep_var);
+  int width = var_get_width (proc->indep_var);
+
+  if ( value_equal (val, &proc->g_value[0], width))
+    return true;
+
+  if ( value_equal (val, &proc->g_value[1], width))
+    return true;
+
+  return false;
+}
+
 static void
 calculate (struct t_test_proc *proc,
            struct casereader *input, const struct dataset *ds)
@@ -1410,7 +1427,7 @@ calculate (struct t_test_proc *proc,
   struct trbox test_results_box;
   struct taint *taint;
   struct ccase *c;
-
+  int i;
   c = casereader_peek (input, 0);
   if (c == NULL)
     {
@@ -1439,11 +1456,18 @@ calculate (struct t_test_proc *proc,
       break;
     case T_IND_SAMPLES:
       group_calc (dict, proc, casereader_clone (input));
-      int i;
+
       for (i = 0; i < proc->n_vars; ++i)
        {
          struct group_proc *grp_data = group_proc_get (proc->vars[i]);
 
+         if ( proc->criterion == CMP_EQ )
+           {
+             input = casereader_create_filter_func (input, is_criteria_value, NULL,
+                                                    proc, 
+                                                    NULL);
+           }
+
          grp_data->levene = levene ( input, proc->indep_var, proc->vars[i], dict_get_weight (dict), proc->exclude);
        }
       break;