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Why panel tests of purchasing power parity should allow for heterogeneous mean reversion

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  • Koedijk, Kees G.
  • Tims, Ben
  • van Dijk, Mathijs A.

Abstract

Recent studies of purchasing power parity (PPP) use panel tests that fail to take into account heterogeneity in the speed of mean reversion across real exchange rates. In contrast to several other severe restrictions of panel models and tests of PPP, the assumption of homogeneous mean reversion is still widely used and its consequences are virtually unexplored. This paper analyzes the properties of homogeneous and heterogeneous panel unit root testing methodologies. Using Monte Carlo simulation, we uncover important adverse properties of the panel approach that relies on homogeneous estimation and testing. More specifically, power functions are low and assume irregular shapes. Furthermore, homogeneous estimates of the mean reversion parameters exhibit potentially large biases. These properties can lead to misleading inferences on the validity of PPP. Our findings highlight the importance of allowing for heterogeneous estimation when testing for a unit root in panels of real exchange rates.

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Bibliographic Info

Article provided by Elsevier in its journal Journal of International Money and Finance.

Volume (Year): 30 (2011)
Issue (Month): 1 (February)
Pages: 246-267

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Handle: RePEc:eee:jimfin:v:30:y:2011:i:1:p:246-267

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Web page: http://www.elsevier.com/locate/inca/30443

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Keywords: PPP Real exchange rates Panel models Unit root tests Heterogeneity Panel tests;

References

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Cited by:
  1. Mark J. Holmes & Jesús Otero & Theodore Panagiotidis, 2011. "PPP in OECD Countries: An Analysis of Real Exchange Rate Stationarity, Cross-sectional Dependency and Structural Breaks," Koç University-TUSIAD Economic Research Forum Working Papers 1135, Koc University-TUSIAD Economic Research Forum.
  2. Cushman, David O. & Michael, Nils, 2011. "Nonlinear trends in real exchange rates: A panel unit root test approach," Journal of International Money and Finance, Elsevier, vol. 30(8), pages 1619-1637.
  3. Hwa-Taek Lee & Gawon Yoon, 2013. "Does purchasing power parity hold sometimes? Regime switching in real exchange rates," Applied Economics, Taylor & Francis Journals, vol. 45(16), pages 2279-2294, June.

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