For example, spreadsheet software may tell the manager that the slope is 4 and the intercept is 24,000. This implies that the best-fit line has the equation: Total Cost = 4(units produced) + 24,000.

R. W. Farebrother, The Durbin-Watson Test for Serial Correlation when there is no Intercept in the Regression, Econometrica, Vol. 48, No. 6 (Sep., 1980), pp. 1553-1563 Free online reading for over 10 ...