+++ /dev/null
-/* lib/linreg/coefficient.c
-
- Copyright (C) 2005 Free Software Foundation, Inc.
- Written by Jason H Stover.
-
- 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
- 02111-1307, USA.
- */
-
-/*
- Accessor functions for matching coefficients and variables.
- */
-#include <assert.h>
-#include "pspp_linreg.h"
-#include <gl/xalloc.h>
-
-
-struct varinfo
-{
- const struct variable *v; /* Variable associated with this
- coefficient. Note this variable may not
- be unique. In other words, a
- coefficient structure may have other
- v_info's, each with its own variable.
- */
- const union value *val; /* Value of the variable v which this
- varinfo refers to. This member is relevant
- only to categorical variables.
- */
-};
-
-void pspp_linreg_coeff_free (struct pspp_linreg_coeff *c)
-{
- free (c);
-}
-
-/*
- Initialize the variable and value pointers inside the
- coefficient structures for the linear model.
- */
-void
-pspp_linreg_coeff_init (pspp_linreg_cache *c, struct design_matrix *X)
-{
- size_t i;
- size_t j;
- int n_vals = 1;
- struct pspp_linreg_coeff *coeff;
-
- c->coeff = xnmalloc (X->m->size2 + 1, sizeof (*c->coeff));
- for (i = 0; i < X->m->size2; i++)
- {
- j = i + 1; /* The first coefficient is the intercept. */
- coeff = c->coeff + j;
- coeff->n_vars = n_vals; /* Currently, no procedures allow interactions.
- This will have to change when procedures that
- allow interaction terms are written.
- */
- coeff->v_info = xnmalloc (coeff->n_vars, sizeof (*coeff->v_info));
- assert (coeff->v_info != NULL);
- coeff->v_info->v = (const struct variable *) design_matrix_col_to_var (X, i);
-
- if (coeff->v_info->v->type == ALPHA)
- {
- size_t k;
- k = design_matrix_var_to_column (X, coeff->v_info->v);
- assert (k <= i);
- k = i - k;
- coeff->v_info->val = cat_subscript_to_value (k, (struct variable *) coeff->v_info->v);
- }
- }
-}
-void
-pspp_linreg_coeff_set_estimate (struct pspp_linreg_coeff *c,
- double estimate)
-{
- c->estimate = estimate;
-}
-void
-pspp_linreg_coeff_set_std_err (struct pspp_linreg_coeff *c,
- double std_err)
-{
- c->std_err = std_err;
-}
-/*
- How many variables are associated with this coefficient?
- */
-int
-pspp_linreg_coeff_get_n_vars (struct pspp_linreg_coeff *c)
-{
- return c->n_vars;
-}
-/*
- Which variable does this coefficient match?
- */
-const struct variable *
-pspp_linreg_coeff_get_var (struct pspp_linreg_coeff *c, int i)
-{
- assert (i < c->n_vars);
- return (c->v_info + i)->v;
-}
-/*
- Which value is associated with this coefficient/variable comination?
-*/
-const union value *
-pspp_linreg_coeff_get_value (struct pspp_linreg_coeff *c,
- const struct variable *v)
-{
- int i = 0;
- const struct variable *candidate;
-
- while (i < c->n_vars)
- {
- candidate = pspp_linreg_coeff_get_var (c, i);
- if (v->index == candidate->index)
- {
- return (c->v_info + i)->val;
- }
- i++;
- }
- return NULL;
-}