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Alternative Methods for Robust Analysis in Event Study Applications

Lisa A. Kramer

University of Toronto - Rotman School of Management

August 2000

A variety of test statistics have been employed in the finance and accounting literatures for the purpose of conducting hypothesis tests in event studies. This paper begins by formally deriving the result that these statistics do not follow their conventionally assumed asymptotic distribution even for large samples of firms. Test statistics exhibit a statistically significant bias to size in practice, a result that I document extensively. This bias arises partially due to commonly observed stock return traits which violate conditions underlying event study methods. In this paper, I develop two alternatives. The first involves a simple normalization of conventional test statistics and allows for the statistics to follow an asymptotic standard normal distribution. The second approach augments the simple normalization with bootstrap resampling. These alternatives demonstrate remarkable robustness to heteroskedasticity, autocorrelation, non-normality, and event-period model changes, even in small samples, and they are useful for event studies with non-clustered events.

Number of Pages in PDF File: 28

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Date posted: July 27, 2001  

Suggested Citation

Kramer, Lisa A., Alternative Methods for Robust Analysis in Event Study Applications (August 2000). Available at SSRN: https://ssrn.com/abstract=278109 or http://dx.doi.org/10.2139/ssrn.278109

Contact Information

Lisa A. Kramer (Contact Author)
University of Toronto - Rotman School of Management ( email )
105 St. George Street
Toronto, Ontario M5S 3E6
416-978-2496 (Phone)
416-971-3048 (Fax)
HOME PAGE: http://www.chass.utoronto.ca/~lkramer

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References:  55
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