NAG Library Manual, Mark 29.2
```/* nag_univar_outlier_peirce_1var (g07gac) Example Program.
*
* Copyright 2023 Numerical Algorithms Group.
*
* Mark 29.2, 2023.
*/

/* Pre-processor includes */
#include <math.h>
#include <nag.h>
#include <stdio.h>

int main(void) {

/* Integer scalar and array declarations */
Integer i, n, niout, p, exit_status, ldiff;
Integer *iout = 0;

/* NAG structures */
NagError fail;

/* Double scalar and array declarations */
double *y = 0, *diff = 0, *llamb = 0;

/* Let the routine calculate the mean and variance from the supplied data */
double mean = 0.0;
double var = 0.0;

exit_status = 0;

/* Initialize the error structure */
INIT_FAIL(fail);

printf("nag_univar_outlier_peirce_1var (g07gac) Example Program Results\n");

/* Skip headings in data file */
scanf("%*[^\n] ");

/* Read in the problem size */
scanf("%" NAG_IFMT " %" NAG_IFMT " %" NAG_IFMT "%*[^\n] ", &n, &p, &ldiff);

if (!(y = NAG_ALLOC(n, double)) || !(diff = NAG_ALLOC(ldiff, double)) ||
!(llamb = NAG_ALLOC(ldiff, double)) || !(iout = NAG_ALLOC(n, Integer))) {
printf("Allocation failure\n");
exit_status = -1;
goto END;
}

/* Read in the data */
for (i = 0; i < n; i++)
scanf("%lf%*[^\n] ", &y[i]);

/* Use nag_univar_outlier_peirce_1var (g07gac) to get a list of potential
* outliers */
nag_univar_outlier_peirce_1var(n, p, y, mean, var, iout, &niout, ldiff, diff,
llamb, &fail);
if (fail.code != NE_NOERROR) {
printf("Error from nag_univar_outlier_peirce_1var (g07gac).\n%s\n",
fail.message);
exit_status = 1;
goto END;
}

/* Display the potential outliers */
printf("\n");
printf(" Number of potential outliers: %" NAG_IFMT "\n", niout);
if (ldiff > 0) {
printf(" %5s  %5s %8s   %8s    %8s\n", "No.", "Index", "Value", "Diff",
"ln(lambda^2)");
} else {
printf(" %5s  %5s %8s\n", "No.", "Index", "Value");
}
for (i = 0; i < niout; i++)
if (i < ldiff) {
printf("%5" NAG_IFMT " %5" NAG_IFMT " %10.2f %10.2f %10.2f\n", i + 1,
iout[i], y[iout[i] - 1], diff[i], llamb[i]);
} else {
printf("%5" NAG_IFMT " %5" NAG_IFMT " %10.2f\n", i + 1, iout[i],
y[iout[i] - 1]);
}

END:
NAG_FREE(y);
NAG_FREE(diff);
NAG_FREE(llamb);
NAG_FREE(iout);

return exit_status;
}
```