Department of Economics, UCSD
Local Power Functions of Tests for Double Unit Roots
- Author(s): Haldrup, Niels, Prof.
- Lildholdt, Peter
- et al.
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.