Scandinavian Working Papers in Economics
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Department of Economics, Lund University Working Papers, Department of Economics, Lund University

No 2001:21:
TAR models and real exchange rates

Martin Johansson

Abstract: The recent past has seen an increased interest in piecewise linear real exchange rate models. By invoking Heckscher's (1916) 'commodity points' it has been argued that a threshold autoregressive (TAR) model should be used to study movements in the real exchange rate. This paper examines the problems of fitting TAR models to real exchange rates. We find that the power of the tests for TAR behavior can be very low for realistic parameter settings. Moreover the confidence intervalls for the threshold parameter are too wide to be used for economic analysis.

Keywords: PPP; real exchange rate; threshold autoregression; (follow links to similar papers)

JEL-Codes: C52; F31; (follow links to similar papers)

16 pages, November 14, 2001

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