Panel Stationarity Test with Structural Breaks
In this paper, we extend the heterogeneous panel data stationarity test of Hadri ["Econometrics Journal", Vol. 3 (2000) pp. 148-161] to the cases where breaks are taken into account. Four models with different patterns of breaks under the null hypothesis are specified. Two of the models have been already proposed by Carrion-i-Silvestre "et al." ["Econometrics Journal", Vol. 8 (2005) pp. 159-175]. The moments of the statistics corresponding to the four models are derived in closed form via characteristic functions. We also provide the exact moments of a modified statistic that do not asymptotically depend on the location of the break point under the null hypothesis. The cases where the break point is unknown are also considered. For the model with breaks in the level and no time trend and for the model with breaks in the level and in the time trend, Carrion-i-Silvestre "et al." ["Econometrics Journal", Vol. 8 (2005) pp. 159-175] showed that the number of breaks and their positions may be allowed to differ across individuals for cases with known and unknown breaks. Their results can easily be extended to the proposed modified statistic. The asymptotic distributions of all the statistics proposed are derived under the null hypothesis and are shown to be normally distributed. We show by simulations that our suggested tests have in general good performance in finite samples except the modified test. In an empirical application to the consumer prices of 22 OECD countries during the period from 1953 to 2003, we found evidence of stationarity once a structural break and cross-sectional dependence are accommodated. Copyright (c) Blackwell Publishing Ltd and the Department of Economics, University of Oxford, 2008.
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Volume (Year): 70 (2008)
Issue (Month): 2 (04)
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