112 		    double *slope, double *r_stddev, double *r_max)  in regress()  argument
129 	*slope = (xy_sum - x_sum * y_sum / n) / (x2_sum - x_sum * x_sum / n);  in regress()
130 	*intercept = (y_sum - *slope * x_sum) / n;  in regress()
137 		r = fabs(x * *slope + *intercept - y);  in regress()
149 	double intercept, slope, stddev1, max1, stddev2, max2;  in run_test()  local
173 		regress(samples, SAMPLES, &intercept, &slope, &stddev1, &max1);  in run_test()
174 		mono_freq_offset = slope;  in run_test()
180 	regress(samples, SAMPLES / 2, &intercept, &slope, &stddev1, &max1);  in run_test()
181 	freq_error1 = slope * (1.0 - mono_freq_offset) - mono_freq_offset -  in run_test()
184 	regress(samples + SAMPLES / 2, SAMPLES / 2, &intercept, &slope,  in run_test()
186 	freq_error2 = slope * (1.0 - mono_freq_offset) - mono_freq_offset -  in run_test()