```/* nag_regsn_std_resid_influence (g02fac) Example Program.
*
* Copyright 2017 Numerical Algorithms Group.
*
* Mark 26.2, 2017.
*/

#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("%" NAG_IFMT " %" NAG_IFMT " %" NAG_IFMT " %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("%2" NAG_IFMT "", i + 1);
for (j = 0; j < 4; j++)
printf("%14.3f", SRES(i, j));
printf("\n");
}
END:
NAG_FREE(h);
NAG_FREE(res);
NAG_FREE(sres);
return exit_status;
}
```