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On the inadmissibility of classical tests in unit-root-type situations

Author

Listed:
  • Werner Ploberger

Abstract

In this paper it is shown that "classical" tests can become asymptotically inadmissible (i.e. we show that there exist uniformly better tests) if the information matrix becomes stochastic: A typical example is the augmented Dickey-Fuller test for unit roots (in case of no deterministic trend. We also apply our results to tests based on mixed-normal estimators (which typically occur in the analysis of cointegrating relationsships)

Suggested Citation

  • Werner Ploberger, 2004. "On the inadmissibility of classical tests in unit-root-type situations," Econometric Society 2004 North American Winter Meetings 461, Econometric Society.
    • Handle: RePEc:ecm:nawm04:461
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    More about this item

    Keywords

    testing; admissibility; nonstationarity;
    All these keywords.

    JEL classification:

    • C12 - Mathematical and Quantitative Methods - - Econometric and Statistical Methods and Methodology: General - - - Hypothesis Testing: General
    • C32 - Mathematical and Quantitative Methods - - Multiple or Simultaneous Equation Models; Multiple Variables - - - Time-Series Models; Dynamic Quantile Regressions; Dynamic Treatment Effect Models; Diffusion Processes; State Space Models

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