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[p, q] = get_products();
quad = quad_error(q(29:42, :), mean_pred(q(1:28, :), 14));
total = total_error(q(29:42, :), mean_pred(q(1:28, :), 14));
printf('quad mean : %9d\n', quad);
printf('total mean : %9d\n', total);
quad = quad_error(p(29:42, :), regress_pred(p, q(1:28, :)));
total = total_error(p(29:42, :), regress_pred(p, q(1:28, :)));
printf('quad regress : %9d\n', quad);
printf('total regress: %9d\n', total);
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