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Nonparametric Cointegration Analysis of Fractional Systems With Unknown Integration Orders

  • Morten Ørregaard Nielsen

    ()

    (Queen's University and CREATES)

In this paper a nonparametric variance ratio testing approach is proposed for determining the cointegration rank in fractionally integrated systems. The test statistic is easily calculated without prior knowledge of the integration order of the data, the strength of the cointegrating relations, or the cointegration vector(s). The latter property makes it easier to implement than regression-based approaches, especially when examining relationships between several variables with possibly multiple cointegrating vectors. Since the test is nonparametric, it does not require the specification of a particular model and is invariant to short-run dynamics. Nor does it require the choice of any smoothing parameters that change the test statistic without being reflected in the asymptotic distribution. Furthermore, a consistent estimator of the cointegration space can be obtained from the procedure. The asymptotic distribution theory for the proposed test is non-standard but easily tabulated or simulated. Monte Carlo simulations demonstrate excellent finite sample properties, even rivaling those of well-specified parametric tests. The proposed methodology is applied to the term structure of interest rates, where, contrary to both fractional and integer-based parametric approaches, evidence in favor of the expectations hypothesis is found using the nonparametric approach.

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File URL: http://qed.econ.queensu.ca/working_papers/papers/qed_wp_1174.pdf
File Function: First version 2008
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Paper provided by Queen's University, Department of Economics in its series Working Papers with number 1174.

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Length: 37 pages
Date of creation: Jul 2008
Date of revision:
Handle: RePEc:qed:wpaper:1174
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