/* nag_shapiro_wilk_test (g01ddc) Example Program. * * Copyright 1996 Numerical Algorithms Group. * * Mark 4, 1996. * Mark 8 revised, 2004. * */ #include #include #include #include #include int main(void) { /* Local variables */ Nag_Boolean calwts; Integer exit_status=0, i, j, n; NagError fail; double *a=0, pw, w, *x=0; INIT_FAIL(fail); Vprintf("nag_shapiro_wilk_test (g01ddc) Example Program Results\n"); /* Skip heading in data file */ Vscanf("%*[^\n] "); calwts = Nag_TRUE; Vscanf("%ld ", &n); if (n>=3) { if ( !( a = NAG_ALLOC(n, double)) || !( x = NAG_ALLOC(n, double)) ) { Vprintf("Allocation failure\n"); exit_status = -1; goto END; } } else { Vprintf("Invalid n.\n"); exit_status = 1; return exit_status; } for (j = 1; j <= 2; ++j) { for (i = 1; i <= n; ++i) Vscanf("%lf ", &x[i - 1]); /* nag_double_sort (m01cac). * Quicksort of set of values of data type double */ nag_double_sort(x, (size_t)n, Nag_Ascending,&fail); if (fail.code != NE_NOERROR) { Vprintf("Error from nag_double_sort (m01cac).\n%s\n", fail.message); exit_status = 1; goto END; } /* nag_shapiro_wilk_test (g01ddc). * Shapiro and Wilk's W test for Normality */ nag_shapiro_wilk_test(n, x, calwts, a, &w, &pw, &fail); if (fail.code != NE_NOERROR) { Vprintf("Error from nag_shapiro_wilk_test (g01ddc).\n%s\n", fail.message); exit_status = 1; goto END; } Vprintf("\n For sample number %2ld, value of W statistic = " "%7.4f\n", j, w); Vprintf(" Significance level is %8.4f\n", pw); calwts = Nag_FALSE; } END: if (a) NAG_FREE(a); if (x) NAG_FREE(x); return exit_status; }