Testing Stationarity in Small‐ and Medium‐Sized Samples When Disturbances are Serially Correlated

22 Pages Posted: 16 Sep 2011

Date Written: October 2011

Abstract

In this article, we study the size distortions of the KPSS test for stationarity when serial correlation is present and samples are small‐ and medium‐sized. It is argued that two distinct sources of the size distortions can be identified. The first source is the finite‐sample distribution of the long‐run variance estimator used in the KPSS test, while the second source of the size distortions is the serial correlation not captured by the long‐run variance estimator because of a too narrow choice of truncation lag parameter. When the relative importance of the two sources is studied, it is found that the size of the KPSS test can be reasonably well controlled if the finite‐sample distribution of the KPSS test statistic, conditional on the time‐series dimension and the truncation lag parameter, is used. Hence, finite‐sample critical values, which can be applied to reduce the size distortions of the KPSS test, are supplied. When the power of the test is studied, it is found that the price paid for the increased size control is a lower raw power against a non‐stationary alternative hypothesis.

JEL Classification: C12, C14, C15, C22, E21

Suggested Citation

Jonsson, Kristian, Testing Stationarity in Small‐ and Medium‐Sized Samples When Disturbances are Serially Correlated (October 2011). Oxford Bulletin of Economics and Statistics, Vol. 73, Issue 5, pp. 669-690, 2011, Available at SSRN: https://ssrn.com/abstract=1928411 or http://dx.doi.org/10.1111/j.1468-0084.2010.00620.x

Kristian Jonsson (Contact Author)

affiliation not provided to SSRN

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