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A new unit root test with two structural breaks in level and slope at unknown time

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  • Narayan, Paresh
  • Popp, Stephan

Abstract

In this paper, we propose a new augmented Dickey-Fuller-type test for unit roots which accounts for two structural breaks. We consider two different specifications: (a) two breaks in the level of a trending data series and (b) two breaks in the level and slope of a trending data series. The breaks whose time of occurrence is assumed to be unknown are modeled as innovational outliers and thus take effect gradually. Using Monte Carlo simulations, we show that our proposed test has correct size, stable power, and identifies the structural breaks accurately.
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  • Narayan, Paresh & Popp, Stephan, 2009. "A new unit root test with two structural breaks in level and slope at unknown time," Working Papers eco_2009_11, Deakin University, Department of Economics.
    • Handle: RePEc:dkn:econwp:eco_2009_11
    DOI: 10.1080/02664760903039883
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    1. Lee, Junsoo & Strazicich, Mark C, 2001. "Break Point Estimation and Spurious Rejections with Endogenous Unit Root Tests," Oxford Bulletin of Economics and Statistics, Department of Economics, University of Oxford, vol. 63(5), pages 535-558, December.
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