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I. INTRODUCTION Contrasting inferences about the presence of cointegration often appear in empirical investigations. For example, in applying the commonly used âtwostepâ procedure proposed by Engle and Granger ( 1987), the Dickey-Fuller unit-root test may only marginally reject the null hypothesis of no cointegration, if it rejects at all. By contrast, the coefficient on the error-correction term in the corresponding dynamic model of the same data may be âhighly statistically significantâ, strongly supporting cointegration; cf. Kremers (1989), Hendry and Ericsson (1991a), and Campos and Ericsson (1988). Both procedures are tests of cointegration, so why should there be such a contrast? A plausible explanation centers on an implicit common factor restriction imposed when using the Dickey-Fuller statistic to test for cointegration. If that restriction is invalid, the Dickey-Fuller test remains consistent, but loses power relative to cointegration tests that do not impose a common factor restriction, such as those based upon the estimated error\ correction coefficient. This paper examines the asymptotic and finite sample properties of the two procedures for a simple, single-lag, bivariate process. Even with more lags and more variabIes, the reason for the low power of the Dickey-Fuller test remains. The error-correction-based test is preferable because
Oxford Bulletin of Economics & Statistics – Wiley
Published: Aug 1, 1992
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