A RESIDUAL-BASED LM-TYPE TEST AGAINST FRACTIONAL COINTEGRATION

Uwe Hassler and Jörg Breitung ()

Econometric Theory, 2006, vol. 22, issue 6, 1091-1111

Abstract: Nonstationary integrated time series may be fractionally cointegrated. Here we propose a test for the null hypothesis of no cointegration. It builds on the asymptotically normal Lagrange multiplier (LM) test against fractional alternatives applied to single equation residuals. It is shown that the LM test applied naively to residuals from a static level regression does not retain asymptotic normality. However, when the LM statistic is employed with residuals from a regression of differenced variables, then the test statistic is shown to have a standard normal limiting distribution. Monte Carlo experiments establish its relevance in finite samples.We thank Norbert Christopeit and three anonymous referees for corrections and very valuable comments.

Date: 2006
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