/* nag_regsn_std_resid_influence (g02fac) Example Program.
 *
 * Copyright 1990 Numerical Algorithms Group.
 *
 * Mark 1, 1990.
 * Mark 8 revised, 2004.
 */

#include <nag.h>
#include <stdio.h>
#include <nag_stdlib.h>
#include <nagg02.h>

#define SRES(I, J) sres[(I) *tdsres + J]
int main(void)
{
  Integer  exit_status = 0, i, ip, j, n, nres, tdsres;
  double   *h = 0, *res = 0, rms, *sres = 0;
  NagError fail;

  INIT_FAIL(fail);

  printf(
          "nag_regsn_std_resid_influence (g02fac) Example Program Results\n");
  /* Skip heading in data file */
  scanf("%*[^\n]");
  scanf("%ld %ld %ld %lf", &n, &ip, &nres, &rms);
  if (nres <= n && n > ip+1)
    {
      if (!(h = NAG_ALLOC(n, double)) ||
          !(res = NAG_ALLOC(n, double)) ||
          !(sres = NAG_ALLOC(n*4, double)))
        {
          printf("Allocation failure\n");
          exit_status = -1;
          goto END;
        }
      tdsres = 4;
    }
  else
    {
      printf("Invalid nres or n or ip.\n");
      exit_status = 1;
      return exit_status;
    }
  for (i = 0; i < n; i++)
    scanf("%lf%lf", &res[i], &h[i]);
  /* nag_regsn_std_resid_influence (g02fac).
   * Calculates standardized residuals and influence
   * statistics
   */
  nag_regsn_std_resid_influence(n, ip, nres, res, h, rms, sres, &fail);
  if (fail.code != NE_NOERROR)
    {
      printf(
              "Error from nag_regsn_std_resid_influence (g02fac).\n%s\n",
              fail.message);
      exit_status = 1;
      goto END;
    }
  printf("\n");
  printf("         Internally     Externally\n");
  printf(
          " Obs.    studentized    studentized    Cook's D    Atkinson's T\n");
  printf("          residuals      residuals\n\n");
  for (i = 0; i < nres; i++)
    {
      printf("%2ld", i+1);
      for (j = 0; j < 4; j++)
        printf("%14.3f", SRES(i, j));
      printf("\n");
    }
 END:
  if (h) NAG_FREE(h);
  if (res) NAG_FREE(res);
  if (sres) NAG_FREE(sres);
  return exit_status;
}