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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Paper provided by EconWPA in its series Finance with number
9610002.
Length: 37 pages Date of creation: 15 Oct 1996 Date of revision: Handle: RePEc:wpa:wuwpfi:9610002
Note: Type of Document - Word 6.0/7.0; prepared on Windows; to print on PostScript; pages: 37. Forthcoming in Journal of Banking and Finance. Contact details of provider: Web page: http://129.3.20.41
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Find related papers by JEL classification: G14 - Financial Economics - - General Financial Markets - - - Information and Market Efficiency; Event Studies
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