Testing for Stationarity in a Cointegrated System
Robert Kunst ()
No 117, Economics Series from Institute for Advanced Studies
In systems of variables with a specified or already identified cointegrating rank, stationarity of component variates can be tested by a simple restriction test. The implied decision is often in conflict with the outcome of unit root tests on the same variables. Using a framework of Bayes testing and decision contours, this paper searches for a solution to such conflict situations in sample sizes of empirical relevance. It evolves from the decision contour evaluations that the best test to be used jointly with a restriction test on self-cointegration is a modified version of the Dickey-Fuller test that accounts for the other system variables, whereas strictly univariate unit-root tests do not help much in the decision of interest.
Keywords: Bayes test; Unit roots; Cointegration; Decision contours (search for similar items in EconPapers)
JEL-codes: C11 C12 C15 C32 (search for similar items in EconPapers)
Pages: 35 pages
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