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Panel Data Tests Of Ppp: A Critical Overview

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Author Info
Guglielmo Maria Caporale ()
Mario Cerrato

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Abstract

This paper reviews recent developments in the analysis of non-stationary panels, focusing on empirical applications of panel unit root and cointegration tests in the context of PPP. It highlights various drawbacks of existing methods. First, unit root tests suffer from severe size distortions in the presence of negative moving average errors. Second, the common demeaning procedure to correct for the bias resulting from homogeneous cross-sectional dependence is not effective; more worryingly, it introduces cross-correlation when it is not already present. Third, standard corrections for the case of heterogeneous cross-sectional dependence do not generally produce consistent estimators. Fourth, if there is between-group correlation in the innovations, the SURE estimator is affected by similar problems to FGLS methods, and does not necessarily outperform OLS. Finally, cointegration between different groups in the panel could also be a source of size distortions. We offer some empirical guidelines to deal with these problems, but conclude that panel methods are unlikely to solve the PPP puzzle.

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Paper provided by Economics and Finance Section, School of Social Sciences, Brunel University in its series Economics and Finance Discussion Papers with number 04-18.

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Length: 42 pages
Date of creation: Oct 2004
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Handle: RePEc:bru:bruedp:04-18

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Cited by:
(explanations, Please report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile, click on "citations" and make appropriate adjustments.)

  1. Wagner, Martin, 2005. "On PPP, Unit Roots and Panels," Economics Series 176, Institute for Advanced Studies. [Downloadable!]
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  2. Guglielmo Maria Caporale & Christoph Hanck, 2006. "Cointegration Tests of PPP: Do they also Exhibit Erratic Behaviour?," CESifo Working Paper Series CESifo Working Paper No. , CESifo Group Munich. [Downloadable!]
  3. Guglielmo Maria Caporale & Christoph Hanck, 2006. "Cointegration Tests Of Ppp:Do They Also Exhibit Erratic Behaviour?," Economics and Finance Discussion Papers 06-18, Economics and Finance Section, School of Social Sciences, Brunel University. [Downloadable!]
  4. Guglielmo Maria Caporale & Christoph Hanck, 2006. "Are PPP Tests Erratically Behaved? Some Panel Evidence," Economics and Finance Discussion Papers 06-22, Economics and Finance Section, School of Social Sciences, Brunel University. [Downloadable!]
  5. Julián Ramajo Hernández(1) & Montserrat Ferré Carracedo(2), . "Testing For Long-Run Purchasing Power Parity In The Post Bretton Woods Era: Evidence From Old And New Tests," Working Papers 24-05 Classification-JEL , Instituto de Estudios Fiscales. [Downloadable!]
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