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Local Power Functions of Tests for Double Unit Roots

  • Author(s): Haldrup, Niels, Prof.
  • Lildholdt, Peter
  • et al.
Abstract

The purpose of this paper is to characterize three commonly used double unit root tests in terms of their asymptotic local power. To this end, we study a class of nearly doubly integrated processes which in the limit will behave as a weighted integral of a double indexed Ornstein-Uhlenbeck process. Based on a numerical examination of the analytical distributions, a comparison of the tests is made via their asymptotic local power functions.

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