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EVENT STUDY METHODS AND EVIDENCE ON THEIR PERFORMANCE

EVENT STUDY METHODS AND EVIDENCE ON THEIR PERFORMANCE Abstract. The paper outlines widely used methods of estimating abnormal returns and testing their significance, highlights respects in which they differ conceptually, and reviews research comparing results they produce in various empirical contexts. Direct evidence on the performance of different methods is available from simulation experiments in which known levels of abnormal return are added. The market model is most commonly used to generate expected returns and no better alternative has yet been found despite the weak relationship between beta and actual returns. Choice of procedure for significance testing depends on the characteristics of the data. The evidence indicates that in many cases the best procedure is to standardise market model abnormal returns by their time series standard errors of regression and use the t‐test. Alternatively a rank test appears to be at least as powerful. If errors are cross‐correlated or increase in variance during the test period, other methods discussed should be used. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Economic Surveys Wiley

EVENT STUDY METHODS AND EVIDENCE ON THEIR PERFORMANCE

Journal of Economic Surveys , Volume 9 (1) – Mar 1, 1995

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References (64)

Publisher
Wiley
Copyright
Copyright © 1995 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0950-0804
eISSN
1467-6419
DOI
10.1111/j.1467-6419.1995.tb00109.x
Publisher site
See Article on Publisher Site

Abstract

Abstract. The paper outlines widely used methods of estimating abnormal returns and testing their significance, highlights respects in which they differ conceptually, and reviews research comparing results they produce in various empirical contexts. Direct evidence on the performance of different methods is available from simulation experiments in which known levels of abnormal return are added. The market model is most commonly used to generate expected returns and no better alternative has yet been found despite the weak relationship between beta and actual returns. Choice of procedure for significance testing depends on the characteristics of the data. The evidence indicates that in many cases the best procedure is to standardise market model abnormal returns by their time series standard errors of regression and use the t‐test. Alternatively a rank test appears to be at least as powerful. If errors are cross‐correlated or increase in variance during the test period, other methods discussed should be used.

Journal

Journal of Economic SurveysWiley

Published: Mar 1, 1995

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