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Bootstrap Determination of the Co-integration Rank in Heteroskedastic VAR Models

  • Giuseppe Cavaliere


    (Department of Statistical Sciences, University of Bologna)

  • Anders Rahbek


    (Department of Economics, University of Copenhagen and CREATES)

  • A.M.Robert Taylor


    (School of Economics and Granger Centre for Time Series Econometrics, University of Nottingham)

In a recent paper Cavaliere et al. (2012) develop bootstrap implementations of the (pseudo-) likelihood ratio [PLR] co-integration rank test and associated sequential rank determination procedure of Johansen (1996). The bootstrap samples are constructed using the restricted parameter estimates of the underlying VAR model which obtain under the reduced rank null hypothesis. They propose methods based on an i.i.d. bootstrap re-sampling scheme and establish the validity of their proposed bootstrap procedures in the context of a co-integrated VAR model with i.i.d. innovations. In this paper we investigate the properties of their bootstrap procedures, together with analogous procedures based on a wild bootstrap re-sampling scheme, when time-varying behaviour is present in either the conditional or unconditional variance of the innovations. We show that the bootstrap PLR tests are asymptotically correctly sized and, moreover, that the probability that the associated bootstrap sequential procedures select a rank smaller than the true rank converges to zero. This result is shown to hold for both the i.i.d. and wild bootstrap variants under conditional heteroskedasticity but only for the latter under unconditional heteroskedasticity. Monte Carlo evidence is reported which suggests that the bootstrap approach of Cavaliere et al. (2012) signi?cantly improves upon the ?nite sample performance of corresponding procedures based on either the asymptotic PLR test or an alternative bootstrap method (where the short run dynamics in the VAR model are estimated unrestrictedly) for a variety of conditionally and unconditionally heteroskedastic innovation processes.

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Paper provided by School of Economics and Management, University of Aarhus in its series CREATES Research Papers with number 2012-36.

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Length: 36
Date of creation: 31 Aug 2012
Date of revision:
Handle: RePEc:aah:create:2012-36
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