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Panel Unit Root Tests in the Presence of a Multifactor Error Structure

  • Pesaran, M. Hashem

    ()

    (University of Cambridge)

  • Smith, L. Vanessa

    ()

    (University of Cambridge)

  • Yamagata, Takashi

    ()

    (University of York)

This paper extends the cross sectionally augmented panel unit root test proposed by Pesaran (2007) to the case of a multifactor error structure. The basic idea is to exploit information regarding the unobserved factors that are shared by other time series in addition to the variable under consideration. Importantly, our test procedure only requires specification of the maximum number of factors, in contrast to other panel unit root tests based on principal components that require in addition the estimation of the number of factors as well as the factors themselves. Small sample properties of the proposed test are investigated by Monte Carlo experiments, which suggest that it controls well for size in almost all cases, especially in the presence of serial correlation in the error term, contrary to alternative test statistics. Empirical applications to Fisher's inflation parity and real equity prices across different markets illustrate how the proposed test works in practice.

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Paper provided by Institute for the Study of Labor (IZA) in its series IZA Discussion Papers with number 3254.

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Length: 56 pages
Date of creation: Dec 2007
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Handle: RePEc:iza:izadps:dp3254
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  6. Palm Franz C. & Smeekes Stephan & Urbain Jean-Pierre, 2008. "Cross-Sectional Dependence Robust Block Bootstrap Panel Unit Root Tests," Research Memorandum 048, Maastricht University, Maastricht Research School of Economics of Technology and Organization (METEOR).
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  22. Sandra Eickmeier, 2009. "Comovements and heterogeneity in the euro area analyzed in a non-stationary dynamic factor model," Journal of Applied Econometrics, John Wiley & Sons, Ltd., vol. 24(6), pages 933-959.
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  25. Harris, David & Harvey, David I. & Leybourne, Stephen J. & Sakkas, Nikolaos D., 2010. "Local Asymptotic Power Of The Im-Pesaran-Shin Panel Unit Root Test And The Impact Of Initial Observations," Econometric Theory, Cambridge University Press, vol. 26(01), pages 311-324, February.
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