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Likelihood-Based Confidence Sets for the Timing of Structural Breaks

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  • Eo, Yunjong
  • Morley, James

Abstract

We propose the use of likelihood-based confidence sets for the timing of structural breaks in parameters from time series regression models. The confidence sets are valid for the broad setting of a system of multivariate linear regression equations under fairly general assumptions about the error and regressors and allowing for multiple breaks in mean and variance parameters. In our asymptotic analysis, we determine the critical values for a likelihood ratio test of a break date and the expected length of a likelihood-based confidence set constructed by inverting the likelihood ratio test. Notably, the likelihood-based confidence set is considerably shorter than for other methods employed in the literature. Monte Carlo analysis confirms better performance than other methods in terms of length and coverage accuracy in finite samples, including when the magnitude of breaks is small. An application to postwar U.S. real GDP and consumption leads to a much tighter 95% confidence set for the timing of the "Great Moderation" in the mid-1980s than previously found. Furthermore, when taking cointegration between output and consumption into account, confidence sets for structural break dates are even more precise and suggest a sudden "productivity growth slowdown" in the early 1970s and an additional large, abrupt decline in long-run growth in the mid-1990s.

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File URL: http://hdl.handle.net/2123/7761
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Bibliographic Info

Paper provided by University of Sydney, School of Economics in its series Working Papers with number 2011-07.

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Date of creation: Aug 2011
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Handle: RePEc:syd:wpaper:2123/7761

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Keywords: Markov-chain Monte Carlo; Coverage Accuracy and Expected Length; Intervals and Sets; Confidence; Structural Breaks; Bootstrap Methods; Fiducial Inference;

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  1. Jushan Bai, 1997. "Estimation Of A Change Point In Multiple Regression Models," The Review of Economics and Statistics, MIT Press, vol. 79(4), pages 551-563, November.
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  13. James H. Stock & Mark W. Watson, 1994. "Evidence on Structural Instability in Macroeconomic Time Series Relations," NBER Technical Working Papers 0164, National Bureau of Economic Research, Inc.
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