#include "case.h"
#include "casefile.h"
#include "cat.h"
+#include "cat-routines.h"
#include "command.h"
+#include "design-matrix.h"
#include "dictionary.h"
#include "error.h"
#include "file-handle.h"
#include "lexer.h"
#include <linreg/pspp_linreg.h>
#include "missing-values.h"
+#include "regression_export.h"
#include "tab.h"
#include "var.h"
#include "vfm.h"
-/* (headers) */
+#define REG_LARGE_DATA 1000
+/* (headers) */
/* (specification)
"REGRESSION" (regression_):
f,
defaults,
all;
+ export=custom;
^dependent=varlist;
^method=enter.
*/
*/
size_t *indep_vars;
+/*
+ File where the model will be saved if the EXPORT subcommand
+ is given.
+ */
+struct file_handle *model_file;
+
/*
Return value for the procedure.
*/
statistics_keyword_output (reg_stats_selection, keywords[selection], c);
}
+static void
+reg_print_categorical_encoding (FILE *fp, pspp_linreg_cache *c)
+{
+ int i;
+ size_t j;
+ struct pspp_linreg_coeff coeff;
+ union value *val;
+
+ fprintf (fp, "%s", reg_export_categorical_encode_1);
+
+ for (i = 1; i < c->n_indeps; i++) /* c->coeff[0] is the intercept. */
+ {
+ coeff = c->coeff[i];
+ if (coeff.v->type == ALPHA)
+ {
+ fprintf (fp, "struct pspp_reg_categorical_variable %s;\n\t", coeff.v->name);
+ }
+ }
+ for (i = 1; i < c->n_indeps; i++)
+ {
+ coeff = c->coeff[i];
+ if (coeff.v->type == ALPHA)
+ {
+ fprintf (fp, "%s.name = \"%s\";\n\t", coeff.v->name, coeff.v->name);
+ fprintf (fp, "%s.n_vals = %d;\n\t", coeff.v->name, coeff.v->obs_vals->n_categories);
+ fprintf (fp, "%s.values = {", coeff.v->name);
+ for (j = 0; j < coeff.v->obs_vals->n_categories - 1; j++)
+ {
+ val = cat_subscript_to_value ( (const size_t) j, coeff.v);
+ fprintf (fp, "\"%s\",\n\t\t", val->s);
+ }
+ val = cat_subscript_to_value ( (const size_t) j, coeff.v);
+ fprintf (fp, "\"%s\"};\n\n\t", val->s);
+ }
+ }
+}
+
+static void
+reg_print_depvars (FILE *fp, pspp_linreg_cache *c)
+{
+ int i;
+ struct pspp_linreg_coeff coeff;
+
+ fprintf (fp, "char *model_depvars[%d] = {", c->n_indeps);
+ for (i = 1; i < c->n_indeps; i++)
+ {
+ coeff = c->coeff[i];
+ fprintf (fp, "\"%s\",\n\t\t", coeff.v->name);
+ }
+ coeff = c->coeff[i];
+ fprintf (fp, "\"%s\"};\n\t", coeff.v->name);
+}
+static void
+reg_print_getvar (FILE *fp, pspp_linreg_cache *c)
+{
+ fprintf (fp, "static int\npspp_reg_getvar (char *v_name)\n{\n\t");
+ fprintf (fp, "int i;\n\tint n_vars = %d;\n\t",c->n_indeps);
+ reg_print_depvars (fp, c);
+ fprintf (fp, "for (i = 0; i < n_vars; i++)\n\t{\n\t\t");
+ fprintf (fp, "if (strcmp (v_name, model_depvars[i]) == 0)\n\t\t{\n\t\t\t");
+ fprintf (fp, "return i;\n\t\t}\n\t}\n}\n");
+}
+static void
+subcommand_export (int export, pspp_linreg_cache *c)
+{
+ FILE *fp;
+ size_t i;
+ size_t j;
+ int n_quantiles = 100;
+ double increment;
+ double tmp;
+ struct pspp_linreg_coeff coeff;
+
+ if (export)
+ {
+ assert (c != NULL);
+ assert (model_file != NULL);
+ assert (fp != NULL);
+ fp = fopen (handle_get_filename (model_file), "w");
+ fprintf (fp, "%s", reg_preamble);
+ fprintf (fp, "#include <string.h>\n#include <math.h>\n\n");
+ reg_print_getvar (fp, c);
+ reg_print_categorical_encoding (fp, c);
+ fprintf (fp, "%s", reg_export_t_quantiles_1);
+ increment = 0.5 / (double) increment;
+ for (i = 0; i < n_quantiles - 1; i++)
+ {
+ tmp = 0.5 + 0.005 * (double) i;
+ fprintf (fp, "%.15e,\n\t\t", gsl_cdf_tdist_Pinv (tmp, c->n_obs - c->n_indeps));
+ }
+ fprintf (fp, "%.15e};\n\t", gsl_cdf_tdist_Pinv (.9995, c->n_obs - c->n_indeps));
+ fprintf (fp, "%s", reg_export_t_quantiles_2);
+ fprintf (fp, "%s", reg_mean_cmt);
+ fprintf (fp, "double\npspp_reg_estimate (const double *var_vals,");
+ fprintf (fp, "const char *var_names[])\n{\n\t");
+ fprintf (fp, "double model_coeffs[%d] = {", c->n_indeps);
+ for (i = 1; i < c->n_indeps; i++)
+ {
+ coeff = c->coeff[i];
+ fprintf (fp, "%.15e,\n\t\t", coeff.estimate);
+ }
+ coeff = c->coeff[i];
+ fprintf (fp, "%.15e};\n\t", coeff.estimate);
+ coeff = c->coeff[0];
+ fprintf (fp, "double estimate = %.15e;\n\t", coeff.estimate);
+ fprintf (fp, "int i;\n\tint j;\n\n\t");
+ fprintf (fp, "for (i = 0; i < %d; i++)\n\t", c->n_indeps);
+ fprintf (fp, "%s", reg_getvar);
+ fprintf (fp, "const double cov[%d][%d] = {\n\t", c->n_coeffs, c->n_coeffs);
+ for (i = 0; i < c->cov->size1 - 1; i++)
+ {
+ fprintf (fp, "{");
+ for (j = 0; j < c->cov->size2 - 1; j++)
+ {
+ fprintf (fp, "%.15e, ", gsl_matrix_get (c->cov, i, j));
+ }
+ fprintf (fp, "%.15e},\n\t", gsl_matrix_get (c->cov, i, j));
+ }
+ fprintf (fp, "{");
+ for (j = 0; j < c->cov->size2 - 1; j++)
+ {
+ fprintf (fp, "%.15e, ", gsl_matrix_get (c->cov, c->cov->size1 - 1, j));
+ }
+ fprintf (fp, "%.15e}\n\t", gsl_matrix_get (c->cov, c->cov->size1 - 1, c->cov->size2 - 1));
+ fprintf (fp, "};\n\tint n_vars = %d;\n\tint i;\n\tint j;\n\t", c->n_indeps);
+ fprintf (fp, "double unshuffled_vals[%d];\n\t",c->n_indeps);
+ fprintf (fp, "%s", reg_variance);
+ fprintf (fp, "%s", reg_export_confidence_interval);
+ tmp = c->mse * c->mse;
+ fprintf (fp, "%s %.15e", reg_export_prediction_interval_1, tmp);
+ fprintf (fp, "%s %.15e", reg_export_prediction_interval_2, tmp);
+ fprintf (fp, "%s", reg_export_prediction_interval_3);
+ fclose (fp);
+ fp = fopen ("pspp_model_reg.h", "w");
+ fprintf (fp, "%s", reg_header);
+ fclose (fp);
+ }
+}
+static int
+regression_custom_export (struct cmd_regression *cmd)
+{
+ /* 0 on failure, 1 on success, 2 on failure that should result in syntax error */
+ if (!lex_force_match ('('))
+ return 0;
+
+ if (lex_match ('*'))
+ model_file = NULL;
+ else
+ {
+ model_file = fh_parse ();
+ if (model_file == NULL)
+ return 0;
+ }
+
+ if (!lex_force_match (')'))
+ return 0;
+
+ return 1;
+}
+
int
cmd_regression (void)
{
run_regression (const struct casefile *cf, void *cmd_ UNUSED)
{
size_t i;
- size_t k;
size_t n_data = 0;
size_t row;
size_t case_num;
struct casereader *r2;
struct ccase c;
struct variable *v;
+ struct variable **indep_vars;
struct design_matrix *X;
gsl_vector *Y;
pspp_linreg_cache *lcache;
Read from the active file. The first pass encodes categorical
variables and drops cases with missing values.
*/
+ j = 0;
for (i = 0; i < cmd.n_variables; i++)
{
- v = cmd.v_variables[i];
- if (v->type == ALPHA)
+ if (!is_depvar (i))
{
- /* Make a place to hold the binary vectors
- corresponding to this variable's values. */
- cat_stored_values_create (v);
- }
- for (r = casefile_get_reader (cf);
- casereader_read (r, &c); case_destroy (&c))
- {
- row = casereader_cnum (r) - 1;
-
- val = case_data (&c, v->fv);
- cat_value_update (v, val);
- if (mv_is_value_missing (&v->miss, val))
+ v = cmd.v_variables[i];
+ indep_vars[j] = v;
+ j++;
+ if (v->type == ALPHA)
{
- if (!is_missing_case[row])
+ /* Make a place to hold the binary vectors
+ corresponding to this variable's values. */
+ cat_stored_values_create (v);
+ }
+ for (r = casefile_get_reader (cf);
+ casereader_read (r, &c); case_destroy (&c))
+ {
+ row = casereader_cnum (r) - 1;
+
+ val = case_data (&c, v->fv);
+ cat_value_update (v, val);
+ if (mv_is_value_missing (&v->miss, val))
{
- /* Now it is missing. */
- n_data--;
- is_missing_case[row] = 1;
+ if (!is_missing_case[row])
+ {
+ /* Now it is missing. */
+ n_data--;
+ is_missing_case[row] = 1;
+ }
}
}
}
Y = gsl_vector_alloc (n_data);
X =
- design_matrix_create (n_indep, (const struct variable **) cmd.v_variables,
+ design_matrix_create (n_indep, (const struct variable **) indep_vars,
n_data);
lcache = pspp_linreg_cache_alloc (X->m->size1, X->m->size2);
lcache->indep_means = gsl_vector_alloc (X->m->size2);
case_destroy (&c))
/* Iterate over the cases. */
{
- k = 0;
case_num = casereader_cnum (r2) - 1;
if (!is_missing_case[case_num])
{
pspp_reg_rc = CMD_FAILURE;
return;
}
- lcache->depvar = (const struct var *) v;
+ lcache->depvar = (const struct variable *) v;
gsl_vector_set (Y, row, val->f);
}
else
design_matrix_set_numeric (X, row, v, val);
}
- indep_vars[k] = i;
- k++;
lopts.get_indep_mean_std[i] = 1;
}
}
(const struct variable *) design_matrix_col_to_var (X, i);
assert (lcache->coeff[j].v != NULL);
}
+ /*
+ For large data sets, use QR decomposition.
+ */
+ if (n_data > sqrt (n_indep) && n_data > REG_LARGE_DATA)
+ {
+ lcache->method = PSPP_LINREG_SVD;
+ }
/*
Find the least-squares estimates and other statistics.
*/
pspp_linreg ((const gsl_vector *) Y, X->m, &lopts, lcache);
subcommand_statistics (cmd.a_statistics, lcache);
+ subcommand_export (cmd.sbc_export, lcache);
gsl_vector_free (Y);
design_matrix_destroy (X);
pspp_linreg_cache_free (lcache);
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