Abstract
This paper uses non-linear models to investigate non-stationarity of real GDP per capita for seven OECD countries over the period 1900–2000. Unit root tests based on non-linear models are more powerful than traditional ADF statistics in rejecting the null unit root hypothesis. Empirical results show that, contrary to what the linear ADF statistics suggest, stationarity characterizes five out of the seven countries. This finding stands at variance with other recent studies which conclude that movements in real GDP per capita can be characterized as a non-stationary process.
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Notes
Since only the magnitude of the change in the deviation matters and not the sign, I consider the absolute value of change as the switching variable. Therefore I treat π 1 and π 2 symmetrically so that \(\pi _{2} = 1 - \pi _{1}\) \(\lambda _{1} = - \lambda _{2} = \lambda\). This makes my TAR a two-regime symmetric model.
In a recent paper Blake and Kapetanios (2003) consider a unit root test based on a neural network pure significance test, thus avoiding the specification of an alternative hypothesis. An anonymous referee has suggested this to me.
In fact the null hypothesis (8) tests whether μ* and r* lie in area oebf of Fig. 1.
The data can be downloaded from the Maddison web site. http://www.eco.rug.nl/˜Maddison/
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Acknowledgements
Thanks go to three anonymous referees for extremely detailed and useful comments on a previous version of this paper. Thanks are also due to M.León-Ledesma for providing helpful computational assistance with Gauss code. The usual disclaimer applies to any remaining errors or omissions.
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Christopoulos, D.K. Does a non-linear mean reverting process characterize real GDP movements?. Empirical Economics 31, 601–611 (2006). https://doi.org/10.1007/s00181-005-0034-5
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DOI: https://doi.org/10.1007/s00181-005-0034-5