r2_sum            114 tools/testing/selftests/timers/freq-step.c 	double x, y, r, x_sum, y_sum, xy_sum, x2_sum, r2_sum;
r2_sum            132 tools/testing/selftests/timers/freq-step.c 	*r_max = 0.0, r2_sum = 0.0;
r2_sum            140 tools/testing/selftests/timers/freq-step.c 		r2_sum += r * r;
r2_sum            143 tools/testing/selftests/timers/freq-step.c 	*r_stddev = sqrt(r2_sum / n);