Testing for PPP: Should we use panel methods?

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Testing for PPP: Should we use panel methods?

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Anindya Banerjee ()
Massimiliano Marcellino
Chiara Osbat

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Abstract

A common finding in the empirical literature on the validity of purchasing power parity (PPP) is that it holds when tested for in panel data, but not in univariate (i.e. country-specific) analysis. The usual explanation for this mismatch is that panel tests for unit roots are more powerful than their univariate counterparts. In this paper we suggest an alternative explanation. Existing panel methods assume that cross-unit cointegrating relationships, that would tie the units of the panel together, are not present. Using simulations, we show that if this important underlying assumption of panel unit root tests is violated, the empirical size of the tests is substantially higher than the nominal level, and the null hypothesis of a unit root is rejected too often even when it is true. More generally, this finding warns against the “automatic” use of panel methods for testing for unit roots in macroeconomic time series. Copyright Springer-Verlag 2005

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Publisher Info
Article provided by Springer in its journal Empirical Economics.

Volume (Year): 30 (2005)
Issue (Month): 1 (January)
Pages: 77-91
Download reference. The following formats are available: HTML (with abstract), plain text (with abstract), BibTeX, RIS (EndNote, RefMan, ProCite), ReDIF
Handle: RePEc:spr:empeco:v:30:y:2005:i:1:p:77-91

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Paper
- Anindya Banerjee & Massimiliano Marcellino & Chiara Osbat, . "Testing for PPP: Should We Use Panel Methods?," Working Papers 186, IGIER (Innocenzo Gasparini Institute for Economic Research), Bocconi University. [Downloadable!]
- Banerjee, Anindya & Massimiliano Marcellino & Chiara Osbat, 2002. "Testing for PPP: Should We Use Panel Methods?," Royal Economic Society Annual Conference 2002 13, Royal Economic Society. [Downloadable!]

References listed on IDEAS
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O'Connell, Paul G. J., 1998. "The overvaluation of purchasing power parity," Journal of International Economics, Elsevier, vol. 44(1), pages 1-19, February. [Downloadable!] (restricted)
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Other versions:
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Other versions:
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Other versions:
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Banerjee, A. & Marcellino, M. & Osbat, C., 2000. "Some Cautions on the Use of Panel Methods for Integrated Series of Macro-economic Data," Economics Working Papers eco2000/20, European University Institute.
Other versions:
- Anindya Banerjee & Massimiliano Marcellino & Chiara Osbat, . "Some Cautions on the Use of Panel Methods for Integrated Series of Macro-Economic Data," Working Papers 170, IGIER (Innocenzo Gasparini Institute for Economic Research), Bocconi University. [Downloadable!]
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Other versions:
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Other versions:
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Papell, David H., 2002. "The great appreciation, the great depreciation, and the purchasing power parity hypothesis," Journal of International Economics, Elsevier, vol. 57(1), pages 51-82, June. [Downloadable!] (restricted)
Other versions:
- David Papell, 1998. "The great appreciation, the great depreciation, and the purchasing power parity hypothesis," Working Papers 30, Oesterreichische Nationalbank (Austrian Central Bank). [Downloadable!]
Gonzalo, Jesus & Granger, Clive W J, 1995. "Estimation of Common Long-Memory Components in Cointegrated Systems," Journal of Business & Economic Statistics, American Statistical Association, vol. 13(1), pages 27-35, January.
Other versions:
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Other versions:
- Im, Kyung So & Pesaran, M. Hashem & Shin, Yongcheol, 2003. "Testing for unit roots in heterogeneous panels," Journal of Econometrics, Elsevier, vol. 115(1), pages 53-74, July. [Downloadable!] (restricted)

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