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Empirical evidence on the robustness of the weighted symmetric unit root test

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  • Steven Cook

Abstract

Recent research has shown the Dickey-Fuller (Econometrica, 49, pp. 1057-72, 1979) test to suffer severe size distortion in the presence of structural breaks under the unit root null hypothesis. In contrast, further theoretical results have suggested the weighted symmetric Dickey-Fuller test to be robust to such breaks. In this study, the empirical results of the seminal study of Leybourne et al. (Journal of Econometrics, 87, pp. 191-203, 1998) are revisited to provide an empirical illustration of the robustness of the weighted symmetric Dickey-Fuller test to structural breaks.

Suggested Citation

  • Steven Cook, 2003. "Empirical evidence on the robustness of the weighted symmetric unit root test," Applied Economics Letters, Taylor & Francis Journals, vol. 10(12), pages 761-763.
    • Handle: RePEc:taf:apeclt:v:10:y:2003:i:12:p:761-763
    DOI: 10.1080/1350485032000082009
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    References listed on IDEAS

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    7. Leybourne, Stephen J. & C. Mills, Terence & Newbold, Paul, 1998. "Spurious rejections by Dickey-Fuller tests in the presence of a break under the null," Journal of Econometrics, Elsevier, vol. 87(1), pages 191-203, August.
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