/* PSPP - a program for statistical analysis.
- Copyright (C) 2005 Free Software Foundation, Inc.
+ Copyright (C) 2005, 2009 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
assert (c != NULL);
rsq = c->ssm / c->sst;
adjrsq = 1.0 - (1.0 - rsq) * (c->n_obs - 1.0) / (c->n_obs - c->n_indeps);
- std_error = sqrt ((c->n_indeps - 1.0) / (c->n_obs - 1.0));
+ std_error = sqrt (pspp_linreg_mse (c));
t = tab_create (n_cols, n_rows, 0);
tab_dim (t, tab_natural_dimensions);
tab_box (t, TAL_2, TAL_2, -1, TAL_1, 0, 0, n_cols - 1, n_rows - 1);
int n_cols = 7;
int n_rows = 4;
const double msm = c->ssm / c->dfm;
- const double mse = c->sse / c->dfe;
+ const double mse = pspp_linreg_mse (c);
const double F = msm / mse;
const double pval = gsl_cdf_fdist_Q (F, c->dfm, c->dfe);
Gets the predicted values.
*/
static int
-regression_trns_pred_proc (void *t_, struct ccase *c,
+regression_trns_pred_proc (void *t_, struct ccase **c,
casenumber case_idx UNUSED)
{
size_t i;
n_vals = (*model->get_vars) (model, vars);
vals = xnmalloc (n_vals, sizeof (*vals));
- output = case_data_rw (c, model->pred);
- assert (output != NULL);
+ *c = case_unshare (*c);
+ output = case_data_rw (*c, model->pred);
for (i = 0; i < n_vals; i++)
{
- vals[i] = case_data (c, vars[i]);
+ vals[i] = case_data (*c, vars[i]);
}
output->f = (*model->predict) ((const struct variable **) vars,
vals, model, n_vals);
Gets the residuals.
*/
static int
-regression_trns_resid_proc (void *t_, struct ccase *c,
+regression_trns_resid_proc (void *t_, struct ccase **c,
casenumber case_idx UNUSED)
{
size_t i;
n_vals = (*model->get_vars) (model, vars);
vals = xnmalloc (n_vals, sizeof (*vals));
- output = case_data_rw (c, model->resid);
+ *c = case_unshare (*c);
+ output = case_data_rw (*c, model->resid);
assert (output != NULL);
for (i = 0; i < n_vals; i++)
{
- vals[i] = case_data (c, vars[i]);
+ vals[i] = case_data (*c, vars[i]);
}
- obs = case_data (c, model->depvar);
+ obs = case_data (*c, model->depvar);
output->f = (*model->residual) ((const struct variable **) vars,
vals, obs, model, n_vals);
free (vals);
for (lc = models; lc < models + cmd.n_dependent; lc++)
{
- assert (*lc != NULL);
- assert ((*lc)->depvar != NULL);
- if (cmd.a_save[REGRESSION_SV_RESID])
- {
- reg_save_var (ds, "RES", regression_trns_resid_proc, *lc,
- &(*lc)->resid, n_trns);
- }
- if (cmd.a_save[REGRESSION_SV_PRED])
+ if (*lc != NULL)
{
- reg_save_var (ds, "PRED", regression_trns_pred_proc, *lc,
- &(*lc)->pred, n_trns);
+ if ((*lc)->depvar != NULL)
+ {
+ if (cmd.a_save[REGRESSION_SV_RESID])
+ {
+ reg_save_var (ds, "RES", regression_trns_resid_proc, *lc,
+ &(*lc)->resid, n_trns);
+ }
+ if (cmd.a_save[REGRESSION_SV_PRED])
+ {
+ reg_save_var (ds, "PRED", regression_trns_pred_proc, *lc,
+ &(*lc)->pred, n_trns);
+ }
+ }
}
}
}
struct moments_var *mom)
{
int n_data;
- struct ccase c;
+ struct ccase *c;
size_t i;
assert (vars != NULL);
cat_stored_values_create (vars[i]);
n_data = 0;
- for (; casereader_read (input, &c); case_destroy (&c))
+ for (; (c = casereader_read (input)) != NULL; case_unref (c))
{
/*
The second condition ensures the program will run even if
*/
for (i = 0; i < n_vars; i++)
{
- const union value *val = case_data (&c, vars[i]);
+ const union value *val = case_data (c, vars[i]);
if (var_is_alpha (vars[i]))
cat_value_update (vars[i], val);
else
pspp_coeff_init (c->coeff, dm);
}
-/*
- Put the moments in the linreg cache.
- */
-static void
-compute_moments (pspp_linreg_cache * c, struct moments_var *mom,
- struct design_matrix *dm, size_t n)
-{
- size_t i;
- size_t j;
- double weight;
- double mean;
- double variance;
- double skewness;
- double kurtosis;
- /*
- Scan the variable names in the columns of the design matrix.
- When we find the variable we need, insert its mean in the cache.
- */
- for (i = 0; i < dm->m->size2; i++)
- {
- for (j = 0; j < n; j++)
- {
- if (design_matrix_col_to_var (dm, i) == (mom + j)->v)
- {
- moments1_calculate ((mom + j)->m, &weight, &mean, &variance,
- &skewness, &kurtosis);
- pspp_linreg_set_indep_variable_mean (c, (mom + j)->v, mean);
- pspp_linreg_set_indep_variable_sd (c, (mom + j)->v, sqrt (variance));
- }
- }
- }
-}
-
static bool
run_regression (struct casereader *input, struct cmd_regression *cmd,
struct dataset *ds, pspp_linreg_cache **models)
size_t i;
int n_indep = 0;
int k;
- struct ccase c;
+ struct ccase *c;
const struct variable **indep_vars;
struct design_matrix *X;
struct moments_var *mom;
assert (models != NULL);
- if (!casereader_peek (input, 0, &c))
+ c = casereader_peek (input, 0);
+ if (c == NULL)
{
casereader_destroy (input);
return true;
}
- output_split_file_values (ds, &c);
- case_destroy (&c);
+ output_split_file_values (ds, c);
+ case_unref (c);
if (!v_variables)
{
const struct variable *dep_var;
struct casereader *reader;
casenumber row;
- struct ccase c;
+ struct ccase *c;
size_t n_data; /* Number of valid cases. */
dep_var = cmd->v_dependent[k];
The second pass fills the design matrix.
*/
reader = casereader_create_counter (reader, &row, -1);
- for (; casereader_read (reader, &c); case_destroy (&c))
+ for (; (c = casereader_read (reader)) != NULL; case_unref (c))
{
for (i = 0; i < n_indep; ++i)
{
const struct variable *v = indep_vars[i];
- const union value *val = case_data (&c, v);
+ const union value *val = case_data (c, v);
if (var_is_alpha (v))
design_matrix_set_categorical (X, row, v, val);
else
design_matrix_set_numeric (X, row, v, val);
}
- gsl_vector_set (Y, row, case_num (&c, dep_var));
+ gsl_vector_set (Y, row, case_num (c, dep_var));
}
/*
Now that we know the number of coefficients, allocate space