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COINTEGRATION RANK TESTING UNDERCONDITIONAL HETEROSKEDASTICITY

Published online by Cambridge University Press:  22 March 2010

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Abstract

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We analyze the properties of the conventionalGaussian-based cointegrating rank tests of Johansen(1996, Likelihood-Based Inference in CointegratedVector Autoregressive Models) in the case where thevector of series under test is driven by globallystationary, conditionally heteroskedastic(martingale difference) innovations. We firstdemonstrate that the limiting null distributions ofthe rank statistics coincide with those derived byprevious authors who assume either independent andidentically distributed (i.i.d.) or (strict andcovariance) stationary martingale differenceinnovations. We then propose wild bootstrapimplementations of the cointegrating rank tests anddemonstrate that the associated bootstrap rankstatistics replicate the first-order asymptotic nulldistributions of the rank statistics. We show thatthe same is also true of the corresponding ranktests based on the i.i.d. bootstrap of Swensen(2006, Econometrica 74, 1699–1714).The wild bootstrap, however, has the importantproperty that, unlike the i.i.d. bootstrap, itpreserves in the resampled data the pattern ofheteroskedasticity present in the original shocks.Consistent with this, numerical evidence suggeststhat, relative to tests based on the asymptoticcritical values or the i.i.d. bootstrap, the wildbootstrap rank tests perform very well in smallsamples under a variety of conditionallyheteroskedastic innovation processes. An empiricalapplication to the term structure of interest ratesis given.

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Type
Research Article
Copyright
Copyright © Cambridge University Press 2010