A RESIDUAL-BASED LM-TYPE TEST AGAINST FRACTIONAL COINTEGRATION
针对分数协整的残差型 LM 检验AI 解读 ↓
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针对分数协整的残差型 LM 检验AI 解读 ↓
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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.