/* nag_chi_sq_2_way_table (g11aac) Example Program. * * Copyright 1996 Numerical Algorithms Group. * * Mark 4, 1996. * Mark 8 revised, 2004. * */ #include #include #include #include #define EXPT(I, J) expt[(I) *tdnobs + J] #define CHIST(I, J) chist[(I) *tdnobs + J] #define NOBST(I, J) nobst[(I) *tdnobs + J] int main(void) { Integer exit_status = 0, i, j, ncol, *nobst = 0, nrow, tdnobs; NagError fail; double chi, *chist = 0, df, *expt = 0, g, prob; INIT_FAIL(fail); printf("nag_chi_sq_2_way_table (g11aac) Example Program Results\n\n"); /* Skip heading in data file */ scanf("%*[^\n] "); scanf("%ld %ld %*[^\n] ", &nrow, &ncol); if (nrow >= 2 && ncol >= 2) { if (!(expt = NAG_ALLOC((nrow)*(ncol), double)) || !(chist = NAG_ALLOC((nrow)*(ncol), double)) || !(nobst = NAG_ALLOC((nrow)*(ncol), Integer))) { printf("Allocation failure\n"); exit_status = -1; goto END; } tdnobs = ncol; } else { printf("Invalid nrow or ncol.\n"); exit_status = 1; return exit_status; } for (i = 0; i < nrow; ++i) { for (j = 0; j < ncol; ++j) scanf("%ld", &NOBST(i, j)); scanf("%*[^\n]"); } /* nag_chi_sq_2_way_table (g11aac). * chi^2 statistics for two-way contingency table */ nag_chi_sq_2_way_table(nrow, ncol, nobst, tdnobs, expt, chist, &prob, &chi, &g, &df, &fail); if (fail.code != NE_NOERROR) { printf("Error from nag_chi_sq_2_way_table (g11aac).\n%s\n", fail.message); exit_status = 1; goto END; } printf("Probability = %6.4f\n", prob); printf("Pearson Chi-square statistic = %8.3f\n", chi); printf("Likelihood ratio test statistic = %8.3f\n", g); printf("Degrees of freedom = %4.0f\n", df); END: NAG_FREE(expt); NAG_FREE(chist); NAG_FREE(nobst); return exit_status; }