International Finance Discussion Papers (IFDP)
December 2007
Testing for Cointegration Using the Johansen Methodology when Variables are Near-Integrated
Erik Hjalmarsson and Par Osterholm
Abstract:
We investigate the properties of Johansen's (1988, 1991) maximum eigenvalue and trace tests for cointegration under the empirically relevant situation of near-integrated variables. Using Monte Carlo techniques, we show that in a system with near-integrated variables, the probability of reaching an erroneous conclusion regarding the cointegrating rank of the system is generally substantially higher than the nominal size. The risk of concluding that completely unrelated series are cointegrated is therefore non-negligible. The spurious rejection rate can be reduced by performing additional tests of restrictions on the cointegrating vector(s), although it is still substantially larger than the nominal size.
Full paper (screen reader version)Keywords: Cointegration, near-unit-roots, spurious rejection, Monte Carlo simulations
PDF: Full Paper
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