Asymptotic Distributions of Unit-Root Tests When the Process Is Nearly Stationary
AbstractSeveral test criteria are available for testing the hypothesis that the autoregressive polynomial of an autoregressive moving average process has a single unit root. Schwert (1989), using a Monte Carlo study, investigated the performance of some of the available test criteria. He concluded that the actual levels of the test criteria considered in his study are far from the specified levels when the moving average polynomial also has a root close to 1. This article studies the asymptotic null distribution of the test statistics for testing "rho" = 1 in the model Y(" subscript" t) = "rho" Y("subscript" t-1) + e(" subscript" t) - "theta"e(" subscript" t-1) as "theta" approaches 1. It is shown that the test statistics differ from one another in their asymptotic properties depending on the rate at which "theta" converges to 1.
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Bibliographic InfoArticle provided by American Statistical Association in its journal Journal of Business and Economic Statistics.
Volume (Year): 9 (1991)
Issue (Month): 1 (January)
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