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A modified LLC panel unit root test of the PPP hypothesis

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  • Joakim Westerlund
  • Johan Blomquist

Abstract

In a recent study, Westerlund (Empir Econ 37:517–531, 2009 ) shows that the performance of the popular LLC (Levin et al., J Econ 108:1–24, 2002 ) panel unit root test depends critically on the choice of lag truncation used when correcting for serial correlation, and that it is only when this parameter is set as a function of time that the power raises above size. The purpose of the current paper is to propose a modified test that does not suffer from this drawback. The new test is not only simpler to compute but also superior in terms of small-sample performance, which is illustrated using an example purchasing power parity for less developed countries. Copyright Springer-Verlag 2013

Suggested Citation

  • Joakim Westerlund & Johan Blomquist, 2013. "A modified LLC panel unit root test of the PPP hypothesis," Empirical Economics, Springer, vol. 44(2), pages 833-860, April.
    • Handle: RePEc:spr:empeco:v:44:y:2013:i:2:p:833-860
    DOI: 10.1007/s00181-012-0552-x
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