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Testing for a Unit Root against Nonlinear STAR Models


  • George Kapetanios



In this paper we propose a simple testing procedure to detect the presence of nonstationarity against nonlinear stationarity based on the Smooth Transition Autoregressive modelling approach. We provide an advance over the existing literature in three senses: first, we derive the limiting nonstandard distribution of the proposed NLADF tests; second, we establish the superior power performance of the NLADF test over the standard linear ADF test under the alternative of nonlinear stationarity via Monte Carlo simulation exercises; third we provide an application to ex post real interest rates from six major OECD countries, and find the NLADF test is able to reject a unit root in cases, whereas the linear ADF tests fail.

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  • George Kapetanios, 2000. "Testing for a Unit Root against Nonlinear STAR Models," National Institute of Economic and Social Research (NIESR) Discussion Papers 164, National Institute of Economic and Social Research.
  • Handle: RePEc:nsr:niesrd:178

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    References listed on IDEAS

    1. Benhabib, Jess & Schmitt-Grohe, Stephanie & Uribe, Martin, 2001. "The Perils of Taylor Rules," Journal of Economic Theory, Elsevier, vol. 96(1-2), pages 40-69, January.
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    8. Clarida, Richard & Gali, Jordi & Gertler, Mark, 1998. "Monetary policy rules in practice Some international evidence," European Economic Review, Elsevier, vol. 42(6), pages 1033-1067, June.
    9. Svensson, Lars E. O., 2000. "Open-economy inflation targeting," Journal of International Economics, Elsevier, vol. 50(1), pages 155-183, February.
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    12. Taylor, John B., 1999. "The robustness and efficiency of monetary policy rules as guidelines for interest rate setting by the European central bank," Journal of Monetary Economics, Elsevier, vol. 43(3), pages 655-679, June.
    13. Barrell, Ray & Sefton, James, 1997. "Fiscal Policy and the Masstricht Solvency Criteria," The Manchester School of Economic & Social Studies, University of Manchester, vol. 65(3), pages 259-279, June.
    14. Ray C. Fair, 1998. "Estimated Stabilization Costs of the EMU," National Institute Economic Review, National Institute of Economic and Social Research, vol. 164(1), pages 90-99, April.
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