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Panel unit root testing and the martingale difference hypothesis for German stocks

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  • Matei Demetrescu

    (Goethe University Frankfurt)

Abstract

Several panel unit root tests based on different ways to account for cross-unit dependence are reviewed. The note then illustrates the tests by checking whether the martingale difference hypothesis is appropriate for stock prices on the German stock market: according to the martingale difference hypothesis, logarithmized stock prices follow an integrated process without short-run dynamics. Compared with usual tests for no autocorrelation, unit root tests do not require strong moment conditions and can cope with stock returns series exhibiting infinite kurtosis. Evidence against the martingale difference hypothesis is found in a panel of 30 DAX stocks observed daily between 2004 and 2007.

Suggested Citation

  • Matei Demetrescu, 2009. "Panel unit root testing and the martingale difference hypothesis for German stocks," Economics Bulletin, AccessEcon, vol. 29(3), pages 1749-1759.
    • Handle: RePEc:ebl:ecbull:eb-09-00155
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    References listed on IDEAS

    as
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    More about this item

    Keywords

    Stock price behavior; Dickey-Fuller test; fractional integration; cross-dependent panel; cross-correlation;
    All these keywords.

    JEL classification:

    • C3 - Mathematical and Quantitative Methods - - Multiple or Simultaneous Equation Models; Multiple Variables
    • G1 - Financial Economics - - General Financial Markets

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