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Unusual Behaviour of Dickey-Fuller Tests in the Presence of Trend Misspecification: Comment

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  • Boriss Siliverstovs

Abstract

In this paper we present explanation on the phenomenon pointed out in Cook and Manning (2002) on the unusual behaviour of the Dickey-Fuller test in the presence of trend misspecification. It appears that the rejection frequency of the unit root tests in the presence of trend misspecification is very sensitive to the number of the initial observations that need to be discarded. Based on the evidence from the Monte Carlo simulations, we show that for the DGP in Cook and Manning (2002), the unusual behaviour of the Dickey-Fuller test disappears as the number of the discarded initial observations becomes sufficiently large.

Suggested Citation

  • Boriss Siliverstovs, 2003. "Unusual Behaviour of Dickey-Fuller Tests in the Presence of Trend Misspecification: Comment," Discussion Papers of DIW Berlin 389, DIW Berlin, German Institute for Economic Research.
    • Handle: RePEc:diw:diwwpp:dp389
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    1. repec:ebl:ecbull:v:3:y:2002:i:8:p:1-7 is not listed on IDEAS
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    Keywords

    Dickey-Fuller test; unit root hypothesis testing;

    JEL classification:

    • C1 - Mathematical and Quantitative Methods - - Econometric and Statistical Methods and Methodology: General
    • C5 - Mathematical and Quantitative Methods - - Econometric Modeling

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