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Trading frequency and event study test specification

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  • Cowan, Arnold R.
  • Sergeant, Anne M. A.

Abstract

We examine the effects of thin trading on the specification of event study tests. Simu-lations of upper and lower tail tests are reported with and without variance increases on the event date across levels of trading volume. The traditional standardized test is mis-specified for thinly traded samples. If return variance is unlikely to increase, then Cor-rado’s rank test provides the best specification and power. With variance increases, the rank test is misspecificed. The Boehmer et al. standardized cross-sectional test is properly specified, but not powerful, for upper-tailed tests. Lower-tailed alternative hy-potheses can best be evaluated using the generalized sign test.
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Suggested Citation

  • Cowan, Arnold R. & Sergeant, Anne M. A., 1996. "Trading frequency and event study test specification," Journal of Banking & Finance, Elsevier, vol. 20(10), pages 1731-1757, December.
    • Handle: RePEc:eee:jbfina:v:20:y:1996:i:10:p:1731-1757
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    References listed on IDEAS

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    More about this item

    JEL classification:

    • G14 - Financial Economics - - General Financial Markets - - - Information and Market Efficiency; Event Studies; Insider Trading

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