NAG Library Manual, Mark 29.3
/* nag_nonpar_test_friedman (g08aec) Example Program.
*
* Copyright 2023 Numerical Algorithms Group.
*
* Mark 29.3, 2023.
*/

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

int main(void) {
Integer exit_status = 0, i, ix, j, k, n;
NagError fail;
double fr, sig, *x = 0;

#define X(I, J) x[((I)-1) * n + (J)-1]

INIT_FAIL(fail);

printf("nag_nonpar_test_friedman (g08aec) Example Program Results\n");

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

n = 18;
k = 3;
ix = k;
if (!(x = NAG_ALLOC(ix * n, double))) {
printf("Allocation failure\n");
exit_status = -1;
goto END;
}
for (i = 1; i <= ix; ++i)
for (j = 1; j <= n; ++j)
scanf("%lf", &X(i, j));

printf("\nFriedman test\n");
printf("\nData values\n");
printf("\n   Group  Group  Group\n");
printf("     1      2      3\n");
for (j = 1; j <= 18; ++j) {
for (i = 1; i <= 3; ++i)
printf("%7.1f", X(i, j));
printf("\n");
}
/* nag_nonpar_test_friedman (g08aec).
* Friedman two-way analysis of variance on k matched
* samples
*/
nag_nonpar_test_friedman(k, n, x, n, &fr, &sig, &fail);
if (fail.code != NE_NOERROR) {
printf("Error from nag_nonpar_test_friedman (g08aec).\n%s\n", fail.message);
exit_status = 1;
goto END;
}
printf("\n");
printf("%s%6.3f\n", "Test statistic       ", fr);
printf("%s%6" NAG_IFMT "\n", "Degrees of freedom   ", k - 1);
printf("%s%6.3f\n", "Significance         ", sig);
END:
NAG_FREE(x);
return exit_status;
}