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Real exchange rate forecasting: a calibrated half-life PPP model can beat the random walk

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  • Ca' Zorzi, Michele
  • Muck, Jakub
  • Rubaszek, Michał

Abstract

This paper brings three new insights into the Purchasing Power Parity (PPP) debate. First, we show that a half-life PPP model is able to forecast real exchange rates (RER) better than the random walk (RW) model at both short and long-term horizons. Secondly, we find that this result holds only if the speed of adjustment to the sample mean is calibrated at reasonable values rather than estimated. Finally, we find that it is also preferable to calibrate, rather than to elicit as a prior, the parameter determining the speed of adjustment to PPP. JEL Classification: C32, F31, F37

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Bibliographic Info

Paper provided by European Central Bank in its series Working Paper Series with number 1576.

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Date of creation: Aug 2013
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Handle: RePEc:ecb:ecbwps:20131576

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Keywords: Exchange rate forecasting; half-life; purchasing power parity;

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  1. Nelson Mark & Donggyu Sul, 1998. "Norminal Exchange Rates and Monetary Fundamentals: Evidence from a Small Post-Bretton Woods Panel," Working Papers 98-19, Ohio State University, Department of Economics.
  2. Mark, Nelson C. & Choi, Doo-Yull, 1997. "Real exchange-rate prediction over long horizons," Journal of International Economics, Elsevier, vol. 43(1-2), pages 29-60, August.
  3. Jon Faust & John H. Rogers & Jonathan H. Wright, 2001. "Exchange rate forecasting: the errors we've really made," International Finance Discussion Papers 714, Board of Governors of the Federal Reserve System (U.S.).
  4. Christian J. Murray & David H. Papell, 2000. "The Purchasing Power Parity Persistence Paradigm," Econometric Society World Congress 2000 Contributed Papers 0017, Econometric Society.
  5. Lutz Kilian & Tao Zha, 2002. "Quantifying the uncertainty about the half-life of deviations from PPP," Journal of Applied Econometrics, John Wiley & Sons, Ltd., vol. 17(2), pages 107-125.
  6. Diebold, Francis X & Mariano, Roberto S, 1995. "Comparing Predictive Accuracy," Journal of Business & Economic Statistics, American Statistical Association, vol. 13(3), pages 253-63, July.
  7. Alan M. Taylor & Mark P. Taylor, 2004. "The Purchasing Power Parity Debate," Journal of Economic Perspectives, American Economic Association, vol. 18(4), pages 135-158, Fall.
  8. Efthymios G. Pavlidis & Ivan Paya & David A. Peel, 2012. "Forecast Evaluation of Nonlinear Models: The Case of Long‐Span Real Exchange Rates," Journal of Forecasting, John Wiley & Sons, Ltd., vol. 31(7), pages 580-595, November.
  9. Barbara Rossi, 2005. "Are Exchange Rates Really Random Walks? Some Evidence Robust to Parameter Instability," Data 0503001, EconWPA.
  10. Carlos Felipe Lopez Suarez & Jose Antonio Rodriguez Lopez, 2008. "Nonlinear Exchange Rate Predictability," Working Papers 080911, University of California-Irvine, Department of Economics, revised Sep 2010.
  11. Mark, Nelson C, 1995. "Exchange Rates and Fundamentals: Evidence on Long-Horizon Predictability," American Economic Review, American Economic Association, vol. 85(1), pages 201-18, March.
  12. John C. Robertson & Ellis W. Tallman, 1999. "Vector autoregressions: forecasting and reality," Economic Review, Federal Reserve Bank of Atlanta, issue Q1, pages 4-18.
  13. Chinn, Menzie D. & Meese, Richard A., 1995. "Banking on currency forecasts: How predictable is change in money?," Journal of International Economics, Elsevier, vol. 38(1-2), pages 161-178, February.
  14. Norman, Stephen, 2010. "How well does nonlinear mean reversion solve the PPP puzzle?," Journal of International Money and Finance, Elsevier, vol. 29(5), pages 919-937, September.
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Cited by:
  1. Ca' Zorzi, Michele & Chudik, Alexander, 2013. "Spatial considerations on the PPP debate," Working Paper Series 1534, European Central Bank.

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