A COMPARISON OF SEVERAL EXACT AND APPROXIMATE TESTS FOR STRUCTURAL SHIFT UNDER HETEROSCEDASTICITY

It is known that the Chow test for equality of regression coefficients is not robust to heteroscedasticity. Much recent attention has been paid to this problem by way of new tests. The bulk of the new procedures are justified only asymptotically and little has been done to examine finite sample properties. Even less attention has been focused on comparisons of tests under either the null or alternative hypotheses. In this paper we redress these shortcomings and also contribute by suggesting additional tests. The results indicate that there are tests available with good sampling characteristics, some of which are computationally easy to carry out from both the standpoint of the researcher's time and computation time.