Inference on Co-integration Parameters in Heteroskedastic Vector Autoregressions

H. Peter Boswijk (), Giuseppe Cavaliere, Anders Rahbek and Robert Taylor

No 13-187/III, Tinbergen Institute Discussion Papers from Tinbergen Institute

Abstract: It is well established that the shocks driving many key macro-economic and financial variables display time-varying volatility. In this paper we consider estimation and hypothesis testing on the coefficients of the co-integrating relations and the adjustment coefficients in vector autoregressions driven by both conditional and unconditional heteroskedasticity of a quite general and unknown form in the shocks. We show that the conventional results in Johansen (1996) for the maximum likelihood estimators and associated likelihood ratio tests derived under homoskedasticity do not in general hold in the presence of heteroskedasticity. As a consequence, standard confidence intervals and tests of hypothesis on these coefficients are potentially unreliable. Solutions to this inference problem based on Wald tests (using a "sandwich" estimator of the variance matrix) and on the use of the wild bootstrap are discussed. These do not require the practitioner to specify a parametric model for volatility, or to assume that the pattern of volatility is common to, or independent across, the vector of series under analysis. We formally establish the conditions under which these methods are asymptotically valid. A Monte Carlo simulation study demonstrates that significant improvements in finite sample size can be obtained by the bootstrap over the corresponding asymptotic tests in both heteroskedastic and homoskedastic environments. An application to the term structure of interest rates in the US illustrates the difference between standard and bootstrap inferences regarding hypotheses on the co-integrating vectors and adjustment coefficients.

Keywords: Co-integration; adjustment coefficients; (un)conditional heteroskedasticity; heteroskedasticity-robust inference; wild bootstrap (search for similar items in EconPapers)
JEL-codes: C30 C32 (search for similar items in EconPapers)
Date: 2013-11-19
New Economics Papers: this item is included in nep-ets
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Citations: View citations in EconPapers (4)

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Related works:
Journal Article: Inference on co-integration parameters in heteroskedastic vector autoregressions (2016)
Working Paper: Inference on Co-integration Parameters in Heteroskedastic Vector Autoregressions (2013)
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Persistent link: https://EconPapers.repec.org/RePEc:tin:wpaper:20130187

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