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model_table.c

/*
 *  Copyright (c) by Allin Cottrell
 *
 *   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., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

/* model_table.c for gretl */

#include "gretl.h"
#include "model_table.h"
#include "session.h"
#include "textutil.h"

static MODEL **table_models;
static int n_models;
static int *grand_list;
static int use_tstats;

static void print_rtf_row_spec (PRN *prn, int tall);

#define MAX_TABLE_MODELS 6

static void mtable_errmsg (char *msg, int gui)
{
    if (gui) {
      errbox(msg);
    } else {
      gretl_errmsg_set(msg);
    }
}

static int real_table_n_models (void)
{
    int i, len = 0;

    for (i=0; i<n_models; i++) {
      if (table_models[i] != NULL) len++;
    }

    return len;    
}

static int model_table_too_many (int gui)
{
    if (real_table_n_models() == MAX_TABLE_MODELS) {
      mtable_errmsg(_("Model table is full"), gui);
      return 1;
    }
    return 0;
}

static int model_already_in_table (const MODEL *pmod)
{
    int i;

    for (i=0; i<n_models; i++) {
      if (table_models[i] != NULL && pmod->ID == table_models[i]->ID) {
          return 1;
      }
    }

    return 0;
}

void clear_model_table (PRN *prn)
{
    int i;

    for (i=0; i<n_models; i++) {
      gretl_model_free(table_models[i]);
    }

    free(table_models);
    table_models = NULL;

    free(grand_list);
    grand_list = NULL;
    n_models = 0;
    
    if (prn != NULL) {
      pputs(prn, _("Model table cleared"));
      pputc(prn, '\n');
    }
}

int add_to_model_table (const MODEL *pmod, int add_mode, PRN *prn)
{
    MODEL *mcpy;
    int gui = (add_mode != MODEL_ADD_BY_CMD);

    /* FIXME update restrictions here (garch, mle?) */

    /* NLS models won't work */
    if (pmod->ci == NLS) {
      mtable_errmsg(_("Sorry, NLS models can't be put in the model table"),
                  gui);
      return 1;
    }

    /* nor will ARMA */
    if (pmod->ci == ARMA || pmod->ci == GARCH) {
      mtable_errmsg(_("Sorry, ARMA models can't be put in the model table"),
                  gui);
      return 1;
    }

    /* nor TSLS */
    if (pmod->ci == TSLS) {
      mtable_errmsg(_("Sorry, TSLS models can't be put in the model table"),
                  gui);
      return 1;
    }    

    /* is the list is started or not? */
    if (n_models == 0) {

      table_models = mymalloc(sizeof *table_models);
      if (table_models == NULL) return 1;
      n_models = 1;

    } else {
      MODEL **mods;

      /* check that the dependent variable is in common */
      if (pmod->list[1] != table_models[0]->list[1]) {
          mtable_errmsg(_("Can't add model to table -- this model has a "
                      "different dependent variable"), gui);
          return 1;
      }

      /* check that model is not already on the list */
      if (model_already_in_table(pmod)) {
          mtable_errmsg(_("Model is already included in the table"), 0);
          return 1;
      }

      /* check that the model table is not already full */
      if (model_table_too_many(gui)) {
          return 1;
      }

      n_models++;
      mods = myrealloc(table_models, n_models * sizeof *mods);
      if (mods == NULL) {
          clear_model_table(NULL);
          return 1;
      }

      table_models = mods;
    }

    mcpy = gretl_model_copy(pmod);
    if (mcpy == NULL) {
      clear_model_table(NULL);
      return E_ALLOC;
    }

    table_models[n_models - 1] = mcpy;
    
    if (add_mode == MODEL_ADD_FROM_MENU) {
      infobox(_("Model added to table"));
    } else if (add_mode == MODEL_ADD_BY_CMD) {
      pputs(prn, _("Model added to table"));
      pputc(prn, '\n');
    }

    return 0;
}

static int var_is_in_model (int v, const MODEL *pmod)
{
    int i;

    for (i=2; i<=pmod->list[0]; i++) {
      if (pmod->list[i] == LISTSEP) break;
      if (v == pmod->list[i]) return i;
    }

    return 0;    
}

static int on_grand_list (int v)
{
    int i;

    for (i=2; i<=grand_list[0]; i++) {
      if (v == grand_list[i]) return 1;
    }

    return 0;
}

static void add_to_grand_list (const int *list)
{
    int i, j = grand_list[0] + 1;

    for (i=2; i<=list[0]; i++) {
      if (!on_grand_list(list[i])) {
          grand_list[0] += 1;
          grand_list[j++] = list[i];
      }
    }
}

static int real_list_length (int *list)
{
    int i;

    for (i=1; i<=list[0]; i++) {
      if (list[i] == LISTSEP) return i - 1;
    }

    return list[0];
}

static int make_grand_varlist (void)
{
    int i, j, f = 1;
    int l0 = 0;
    const MODEL *pmod;

    free(grand_list);

    for (i=0; i<n_models; i++) {
      if (table_models[i] == NULL) continue;
      l0 += real_list_length(table_models[i]->list);
    }

    grand_list = mymalloc((l0 + 1) * sizeof *grand_list);
    if (grand_list == NULL) return 1;

    for (i=0; i<n_models; i++) {
      if (table_models[i] == NULL) continue;
      pmod = table_models[i];
      if (f == 1) {
          for (j=0; j<=pmod->list[0]; j++) {
            if (pmod->list[j] == LISTSEP) break;
            grand_list[j] = pmod->list[j];
          }
          f = 0;
      } else {
          add_to_grand_list(pmod->list);
      }
    }

    return 0;
}

static int model_table_is_empty (void)
{
    int i, n = 0;

    if (n_models == 0 || table_models == NULL) { 
      return 1;
    }

    for (i=0; i<n_models; i++) {
      if (table_models[i] != NULL) {
          n++;
      }
    }

    return (n == 0);
}

static int common_estimator (void)
{
    int i, ci0 = -1;

    for (i=0; i<n_models; i++) {
      if (table_models[i] == NULL) continue;
      if (ci0 == -1) {
          ci0 = table_models[i]->ci;
      } else {
          if (table_models[i]->ci != ci0) return 0;
      }
    }  

    return ci0;
}

static int common_df (void)
{
    int i, dfn0 = -1, dfd0 = -1;

    for (i=0; i<n_models; i++) {
      if (table_models[i] == NULL) continue;
      if (dfn0 == -1) {
          dfn0 = table_models[i]->dfn;
          dfd0 = table_models[i]->dfd;
      } else {
          if (table_models[i]->dfn != dfn0) return 0;
          if (table_models[i]->dfd != dfd0) return 0;
      }
    }  

    return 1;
}

static void center_in_field (const char *s, int width, PRN *prn)
{
    int rem = width - strlen(s);

    if (rem <= 1) {
      pprintf(prn, "%s", s);
    }
    else {
      int i, off = rem / 2;

      for (i=0; i<off; i++) {
          pputs(prn, " ");
      }
      pprintf(prn, "%-*s", width - off, s);
    }
}

static const char *short_estimator_string (int ci, PRN *prn)
{
    if (ci == HSK) return N_("HSK");
    else if (ci == CORC) return N_("CORC");
    else if (ci == HILU) return N_("HILU");
    else if (ci == ARCH) return N_("ARCH");
    else if (ci == POOLED) return N_("OLS");
    else return estimator_string(ci, prn);
}

static const char *get_asts (double pval)
{
    return (pval >= 0.1)? "  " : (pval >= 0.05)? "* " : "**";
}

static const char *tex_get_asts (double pval)
{
    return (pval >= 0.1)? "" : (pval >= 0.05)? "$^{*}$" : "$^{**}$";
}

static const char *get_pre_asts (double pval)
{
    return (pval >= 0.1)? "" : (pval >= 0.05)? "$\\,$" : "$\\,\\,$";
}

static void print_model_table_coeffs (PRN *prn)
{
    int i, j, k;
    const MODEL *pmod;
    char tmp[16];
    int tex = tex_format(prn);
    int rtf = rtf_format(prn);

    /* loop across all variables that appear in any model */
    for (i=2; i<=grand_list[0]; i++) {
      int v = grand_list[i];
      int f = 1;

      if (tex) {
          tex_escape(tmp, datainfo->varname[v]);
          pprintf(prn, "%s ", tmp);
      } else if (rtf) {
          print_rtf_row_spec(prn, 0);
          pprintf(prn, "\\intbl \\qc %s\\cell ", datainfo->varname[v]);
      } else {
          pprintf(prn, "%8s ", datainfo->varname[v]);
      }

      /* print the coefficient estimates across a row */
      for (j=0; j<n_models; j++) {
          pmod = table_models[j];
          if (pmod == NULL) continue;
          if ((k = var_is_in_model(v, pmod))) {
            double x = screen_zero(pmod->coeff[k-2]);
            double s = screen_zero(pmod->sderr[k-2]);
            double pval;
            char numstr[32];

            if (floateq(s, 0.0)) {
                if (floateq(x, 0.0)) {
                  pval = 1.0;
                } else {
                  pval = 0.0001;
                }
            } else {
                pval = coeff_pval(pmod, x / s, pmod->dfd);
            }

            sprintf(numstr, "%#.4g", x);
            gretl_fix_exponent(numstr);

            if (tex) {
                if (x < 0) {
                  pprintf(prn, "& %s$-$%s%s ", get_pre_asts(pval),
                        numstr + 1, tex_get_asts(pval));
                } else {
                  pprintf(prn, "& %s%s%s ", get_pre_asts(pval), 
                        numstr, tex_get_asts(pval));
                }
            } else if (rtf) {
                pprintf(prn, "\\qc %s%s\\cell ", numstr, get_asts(pval));
            } else {
                pprintf(prn, "%*s%s", (f == 1)? 12 : 10,
                      numstr, get_asts(pval));
            }
            f = 0;
          } else {
            if (tex) {
                pputs(prn, "& ");
            } else if (rtf) {
                pputs(prn, "\\qc \\cell ");
            } else {
                pputs(prn, "            ");
            }
          }
      }

      /* terminate the coefficient row and start the next one */
      if (tex) {
          pputs(prn, "\\\\\n");
      } else if (rtf) {
          pputs(prn, "\\intbl \\row\n");
          print_rtf_row_spec(prn, 1);
          pputs(prn, "\\intbl ");
      } else {
          pputs(prn, "\n          ");
      }

      /* print the t-stats or standard errors across a row */
      f = 1;
      for (j=0; j<n_models; j++) {
          pmod = table_models[j];
          if (pmod == NULL) {
            continue;
          }
          if ((k = var_is_in_model(v, pmod))) {
            char numstr[32];
            double val;

            if (use_tstats) {
                val = pmod->coeff[k-2] / pmod->sderr[k-2];
            } else {
                val = pmod->sderr[k-2];
            }

            sprintf(numstr, "%#.4g", val);
            gretl_fix_exponent(numstr);

            if (tex) {
                if (val < 0) {
                  pprintf(prn, "& \\footnotesize{($-$%s)} ", numstr + 1);
                } else {
                  pprintf(prn, "& \\footnotesize{(%s)} ", numstr);
                }
            } else if (rtf) {
                if (f == 1) {
                  pputs(prn, "\\qc \\cell ");
                }
                pprintf(prn, "\\qc (%s)\\cell ", numstr);
                f = 0;
            } else {
                sprintf(tmp, "(%s)", numstr);
                pprintf(prn, "%12s", tmp);
            }
          } else {
            if (tex) {
                pputs(prn, "& ");
            } else if (rtf) {
                pputs(prn, "\\qc \\cell ");
            } else {
                pputs(prn, "            ");
            }
          }
      }

      if (tex) {
          pputs(prn, "\\\\ [4pt] \n");
      } else if (rtf) {
          pputs(prn, "\\intbl \\row\n");
      } else {
          pputs(prn, "\n\n");
      }
    }
}

static int any_log_lik (void)
{
    int i;

    for (i=0; i<n_models; i++) {
      if (table_models[i] == NULL) continue;
      if (!na(table_models[i]->lnL)) return 1;
    }

    return 0;
}

static int any_r_squared (void)
{
    int i;

    for (i=0; i<n_models; i++) {
      if (table_models[i] == NULL) continue;
      if (!na(table_models[i]->rsq)) return 1;
    }

    return 0;
}

static void print_n_r_squared (PRN *prn, int *binary)
{
    int j;
    int same_df, any_R2, any_ll;
    const MODEL *pmod;
    int tex = tex_format(prn);
    int rtf = rtf_format(prn);

    if (rtf) print_rtf_row_spec(prn, 0);

    if (tex) pprintf(prn, "$%s$ ", _("n"));
    else if (rtf) pprintf(prn, "\\intbl \\qc %s\\cell ", _("n"));
    else pprintf(prn, "%8s ", _("n"));

    for (j=0; j<n_models; j++) {
      pmod = table_models[j];
      if (pmod == NULL) continue;
      if (tex) pprintf(prn, "& %d ", pmod->nobs);
      else if (rtf) pprintf(prn, "\\qc %d\\cell ", pmod->nobs);
      else pprintf(prn, "%12d", pmod->nobs);
    }

    if (tex) pputs(prn, "\\\\\n");
    else if (rtf) pputs(prn, "\\intbl \\row\n\\intbl ");
    else pputc(prn, '\n');

    same_df = common_df();
    any_R2 = any_r_squared();
    any_ll = any_log_lik();

    if (any_R2) {
      /* print R^2 values */

      if (tex) {
          pputs(prn, (same_df)? "$R^2$" : "$\\bar R^2$ ");
      } else if (rtf) {
          pprintf(prn, "\\qc %s\\cell ", 
                (same_df)? "R{\\super 2}" : _("Adj. R{\\super 2}"));
      } else {
          pprintf(prn, "%9s", (same_df)? _("R-squared") : _("Adj. R**2"));
      }

      for (j=0; j<n_models; j++) {
          pmod = table_models[j];
          if (pmod == NULL) continue;
          if (na(pmod->rsq)) {
            if (tex) {
                pputs(prn, "& ");
            } else if (rtf) {
                pputs(prn, "\\qc \\cell ");
            } else {
                pputs(prn, "            ");
            }           
          }
          else if (pmod->ci == LOGIT || pmod->ci == PROBIT) {
            *binary = 1;
            /* McFadden */
            if (tex) {
                pprintf(prn, "& %.4f ", pmod->rsq);
            } else if (rtf) {
                pprintf(prn, "\\qc %.4f\\cell ", pmod->rsq);
            } else {
                pprintf(prn, "%#12.4g", pmod->rsq);
            }
          } else {
            double rsq = (same_df)? pmod->rsq : pmod->adjrsq;

            if (tex) {
                pprintf(prn, "& %.4f ", rsq);
            } else if (rtf) {
                pprintf(prn, "\\qc %.4f\\cell ", rsq);
            } else {
                pprintf(prn, "%#12.4g", rsq);
            }
          }
      }

      if (tex) pputs(prn, "\\\\\n");
      else if (rtf) pputs(prn, "\\intbl \\row\n");
      else {
          pputc(prn, '\n');
          if (!any_ll) pputc(prn, '\n');
      }
    }

    if (any_ll) {
      /* print log-likelihoods */

      if (tex) {
          pputs(prn, "ln$L$");
      } else if (rtf) {
          pputs(prn, "\\qc lnL\\cell ");
      } else {
          pprintf(prn, "%9s", "lnL");
      }

      for (j=0; j<n_models; j++) {
          pmod = table_models[j];
          if (pmod == NULL) continue;
          if (na(pmod->lnL)) {
            if (tex) {
                pputs(prn, "& ");
            } else if (rtf) {
                pputs(prn, "\\qc \\cell ");
            } else {
                pputs(prn, "            ");
            }           
          } else {
            if (tex) {
                pprintf(prn, "& $-$%.2f ", -pmod->lnL);
            } else if (rtf) {
                pprintf(prn, "\\qc %.3f\\cell ", pmod->lnL);
            } else {
                pprintf(prn, "%#12.6g", pmod->lnL);
            }
          }
      }

      if (tex) pputs(prn, "\\\\\n");
      else if (rtf) pputs(prn, "\\intbl \\row\n");
      else pputs(prn, "\n\n");
    }
}

int display_model_table (int gui)
{
    int j, ci;
    int binary = 0;
    int winwidth = 78;
    PRN *prn;

    if (model_table_is_empty()) {
      mtable_errmsg(_("The model table is empty"), gui);
      return 1;
    }

    if (make_grand_varlist()) return 1;

    if (bufopen(&prn)) {
      clear_model_table(NULL);
      return 1;
    }

    ci = common_estimator();

    if (ci > 0) {
      /* all models use same estimation procedure */
      pprintf(prn, _("%s estimates"), 
            _(estimator_string(ci, prn)));
      pputc(prn, '\n');
    }

    pprintf(prn, _("Dependent variable: %s\n"),
          datainfo->varname[grand_list[1]]);

    pputs(prn, "\n            ");

    for (j=0; j<n_models; j++) {
      char modhd[16];

      if (table_models[j] == NULL) continue;
      sprintf(modhd, _("Model %d"), table_models[j]->ID);
      center_in_field(modhd, 12, prn);
    }
    pputc(prn, '\n');
    
    if (ci == 0) {
      char est[12];     

      pputs(prn, "            ");
      for (j=0; j<n_models; j++) {
          if (table_models[j] == NULL) continue;
          strcpy(est, 
               _(short_estimator_string(table_models[j]->ci,
                                  prn)));
          center_in_field(est, 12, prn);
      }
      pputc(prn, '\n');
    }

    pputc(prn, '\n'); 

    print_model_table_coeffs(prn);
    print_n_r_squared(prn, &binary);

    if (use_tstats) {
      pprintf(prn, "%s\n", _("t-statistics in parentheses"));
    } else {
      pprintf(prn, "%s\n", _("Standard errors in parentheses"));
    }
    pprintf(prn, "%s\n", _("* indicates significance at the 10 percent level"));
    pprintf(prn, "%s\n", _("** indicates significance at the 5 percent level"));
   
    if (binary) {
      pprintf(prn, "%s\n", _("For logit and probit, R-squared is "
                         "McFadden's pseudo-R-squared"));
    }

    if (real_table_n_models() > 5) winwidth = 90;

    view_buffer(prn, winwidth, 450, _("gretl: model table"), VIEW_MODELTABLE, 
            NULL);

    return 0;
}

static int tex_print_model_table (PRN *prn)
{
    int j, ci;
    int binary = 0;
    char tmp[16];

    if (model_table_is_empty()) {
      mtable_errmsg(_("The model table is empty"), 1);
      return 1;
    }

    if (make_grand_varlist()) return 1;

    gretl_print_set_format(prn, GRETL_FORMAT_TEX);

    ci = common_estimator();

    pputs(prn, "\\begin{center}\n");

    if (ci > 0) {
      /* all models use same estimation procedure */
      pprintf(prn, I_("%s estimates"), 
            I_(estimator_string(ci, prn)));
      pputs(prn, "\\\\\n");
    }

    tex_escape(tmp, datainfo->varname[grand_list[1]]);
    pprintf(prn, "%s: %s \\\\\n", I_("Dependent variable"), tmp);

    pputs(prn, "\\vspace{1em}\n\n");
    pputs(prn, "\\begin{tabular}{l");
    for (j=0; j<n_models; j++) {
      pputs(prn, "c");
    }
    pputs(prn, "}\n");

    for (j=0; j<n_models; j++) {
      char modhd[16];

      if (table_models[j] == NULL) continue;
      sprintf(modhd, I_("Model %d"), table_models[j]->ID);
      pprintf(prn, " & %s ", modhd);
    }
    pputs(prn, "\\\\ ");
    
    if (ci == 0) {
      char est[12];

      pputc(prn, '\n');

      for (j=0; j<n_models; j++) {
          if (table_models[j] == NULL) continue;
          strcpy(est, 
               I_(short_estimator_string(table_models[j]->ci,
                                   prn)));
          pprintf(prn, " & %s ", est);
      }
      pputs(prn, "\\\\ ");
    }

    pputs(prn, " [6pt] \n");   

    print_model_table_coeffs(prn);
    print_n_r_squared(prn, &binary);

    pputs(prn, "\\end{tabular}\n\n");
    pputs(prn, "\\vspace{1em}\n");

    if (use_tstats) {
      pprintf(prn, "%s\\\\\n", I_("$t$-statistics in parentheses"));
    } else {
      pprintf(prn, "%s\\\\\n", I_("Standard errors in parentheses"));
    }

    pprintf(prn, "{}%s\\\\\n", 
          I_("* indicates significance at the 10 percent level"));
    pprintf(prn, "{}%s\\\\\n", 
          I_("** indicates significance at the 5 percent level"));

    if (binary) {
      pprintf(prn, "%s\\\\\n", I_("For logit and probit, $R^2$ is "
                            "McFadden's pseudo-$R^2$"));
    }

    pputs(prn, "\\end{center}\n");

    return 0;
}

static void print_rtf_row_spec (PRN *prn, int tall)
{
    int i, cols = 1 + real_table_n_models();
    int col1 = 1000;
    int ht = (tall)? 362 : 262;

    pprintf(prn, "\\trowd \\trqc \\trgaph30\\trleft-30\\trrh%d", ht);
    for (i=0; i<cols; i++) {
      pprintf(prn, "\\cellx%d", col1 +  i * 1400);
    }
    pputc(prn, '\n');
}

static int rtf_print_model_table (PRN *prn)
{
    int j, ci;
    int binary = 0;

    if (model_table_is_empty()) {
      mtable_errmsg(_("The model table is empty"), 1);
      return 1;
    }

    if (make_grand_varlist()) return 1;

    gretl_print_set_format(prn, GRETL_FORMAT_RTF);

    ci = common_estimator();

    pputs(prn, "{\\rtf1\n");

    if (ci > 0) {
      /* all models use same estimation procedure */
      pputs(prn, "\\par \\qc ");
      pprintf(prn, I_("%s estimates"), 
            I_(estimator_string(ci, prn)));
      pputc(prn, '\n');
    }

    pprintf(prn, "\\par \\qc %s: %s\n\\par\n\\par\n{", 
          I_("Dependent variable"),
          datainfo->varname[grand_list[1]]);

    /* RTF row stuff */
    print_rtf_row_spec(prn, 1);

    pputs(prn, "\\intbl \\qc \\cell ");
    for (j=0; j<n_models; j++) {
      char modhd[16];

      if (table_models[j] == NULL) continue;
      sprintf(modhd, I_("Model %d"), table_models[j]->ID);
      pprintf(prn, "\\qc %s\\cell ", modhd);
    }
    pputs(prn, "\\intbl \\row\n");
    
    if (ci == 0) {
      char est[12];

      pputs(prn, "\\intbl \\qc \\cell ");

      for (j=0; j<n_models; j++) {
          if (table_models[j] == NULL) continue;
          strcpy(est, 
               I_(short_estimator_string(table_models[j]->ci, prn)));
          pprintf(prn, "\\qc %s\\cell ", est);
      }
      pputs(prn, "\\intbl \\row\n");
    }

    print_model_table_coeffs(prn);
    print_n_r_squared(prn, &binary);

    pputs(prn, "}\n\n");

    pprintf(prn, "\\par \\qc %s\n", I_("Standard errors in parentheses"));
    pprintf(prn, "\\par \\qc %s\n", 
          I_("* indicates significance at the 10 percent level"));
    pprintf(prn, "\\par \\qc %s\n", 
          I_("** indicates significance at the 5 percent level"));

    if (binary) {
      pprintf(prn, "\\par \\qc %s\n", I_("For logit and probit, "
                                 "R{\\super 2} is "
                                 "McFadden's pseudo-R{\\super 2}"));
    }

    pputs(prn, "\\par\n}\n");

    return 0;
}

int special_print_model_table (PRN *prn)
{
    if (tex_format(prn)) {
      return tex_print_model_table(prn);
    } else if (rtf_format(prn)) {
      return rtf_print_model_table(prn);
    } else {
      return 1;
    }
}

int modeltab_parse_line (const char *line, const MODEL *pmod, PRN *prn)
{
    char cmdword[8];
    int err = 0;

    if (sscanf(line, "%*s %8s", cmdword) != 1) {
      return E_PARSE;
    }

    if (!strcmp(cmdword, "add")) {
      if (pmod == NULL || pmod->ID == 0) {
          gretl_errmsg_set(_("No model is available"));
          err = 1;
      } else {
          err = add_to_model_table(pmod, MODEL_ADD_BY_CMD, prn);
      }
    } else if (!strcmp(cmdword, "show")) {
      err = display_model_table(0);
    } else if (!strcmp(cmdword, "free")) {
      if (model_table_is_empty()) {
          mtable_errmsg(_("The model table is empty"), 0);
          err = 1;
      } else {
          clear_model_table(prn);
      }
    }

    return err;
}

void model_table_dialog (void)
{
    const char *opts[] = {
      N_("standard errors in parentheses"),
      N_("t-statistics in parentheses")
    };
    int opt;

    opt = radio_dialog(_("model table options"), NULL, opts, 2, use_tstats, 0);

    if (opt >= 0) {
      use_tstats = opt;
    }
}


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