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Conditional Methods in Event-Studies and an Equilibrium Justification for Standard Event-Study Procedures

Author

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  • Nagpurnanand R. Prabhala

    () (Robert H. Smith School of Business)

Abstract

The literature on conditional event-study methods criticizes standard event-study procedures as being misspecified, if events are voluntary and investors are rational. We argue, however, that standard procedures (i) lead to statistically valid inferences, under conditions described in the paper and (ii) are often superior means of inference, even when event-study data are generated exactly as per a class of rational expectations specifications introduced by the conditional methods literature. Our results provide an equilibrium justification for traditional event-study methods, and we suggest how these simple procedures may be combined with conditional methods, so as to improve statistical power in event-studies.

Suggested Citation

  • Nagpurnanand R. Prabhala, 1997. "Conditional Methods in Event-Studies and an Equilibrium Justification for Standard Event-Study Procedures," Yale School of Management Working Papers ysm55, Yale School of Management.
  • Handle: RePEc:ysm:somwrk:ysm55
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    Cited by:

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    4. Sven-Olof Fridolfsson & Johan Stennek, 2010. "Industry Concentration and Welfare: On the Use of Stock Market Evidence from Horizontal Mergers," Economica, London School of Economics and Political Science, vol. 77(308), pages 734-750, October.
    5. Guo, Lin & Mech, Timothy S., 2000. "Conditional event studies, anticipation, and asymmetric information: the case of seasoned equity issues and pre-issue information releases," Journal of Empirical Finance, Elsevier, vol. 7(2), pages 113-141, August.
    6. Leuz, Christian & Triantis, Alexander & Yue Wang, Tracy, 2008. "Why do firms go dark? Causes and economic consequences of voluntary SEC deregistrations," Journal of Accounting and Economics, Elsevier, vol. 45(2-3), pages 181-208, August.
    7. Ravi Dhar & William Goetzmann & Ning Zhu & EFA Moscow, 2004. "The Impact of Clientele Changes: Evidence from Stock Splits," Yale School of Management Working Papers ysm369, Yale School of Management, revised 01 Sep 2009.
    8. Andres, Christian & Betzer, André & Doumet, Markus & Theissen, Erik, 2013. "Open market share repurchases in Germany: A conditional event study approach," CFR Working Papers 13-02, University of Cologne, Centre for Financial Research (CFR).
    9. Filson, Darren & Olfati, Saman, 2014. "The impacts of Gramm–Leach–Bliley bank diversification on value and risk," Journal of Banking & Finance, Elsevier, vol. 41(C), pages 209-221.
    10. Maloney, Michael T. & Mulherin, J. Harold, 2003. "The complexity of price discovery in an efficient market: the stock market reaction to the Challenger crash," Journal of Corporate Finance, Elsevier, vol. 9(4), pages 453-479, September.
    11. Guo, Re-Jin & Kruse, Timothy A. & Nohel, Tom, 2008. "Undoing the powerful anti-takeover force of staggered boards," Journal of Corporate Finance, Elsevier, vol. 14(3), pages 274-288, June.
    12. Ian Tonks, 2010. ""Discussion of" To Trade or Not To Trade: The Strategic Trading of Insiders around News Announcements," Journal of Business Finance & Accounting, Wiley Blackwell, vol. 37(3-4), pages 408-421.
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    16. Borochin, Paul & Golec, Joseph, 2016. "Using options to measure the full value-effect of an event: Application to Obamacare," Journal of Financial Economics, Elsevier, vol. 120(1), pages 169-193.
    17. Arie E. Gozluklu & Pietro Perotti & Barbara Rindi & Roberta Fredella, 2013. "Removing the Trade Size Constraint? Evidence from the Italian Market Design," Working Papers 493, IGIER (Innocenzo Gasparini Institute for Economic Research), Bocconi University.
    18. Frédéric Perdreau, 1998. "Désengagements et recentrage en France:1986-1992," Revue Finance Contrôle Stratégie, revues.org, vol. 1(2), pages 137-165, June.
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    21. Irene Karamanou & George P. Nishiotis, 2009. "Disclosure and the Cost of Capital: Evidence from the Market's Reaction to Firm Voluntary Adoption of IAS," Journal of Business Finance & Accounting, Wiley Blackwell, vol. 36(7-8), pages 793-821.
    22. Atul Gupta & Bently Lalatendu Misra, 2007. "Deal size, bid premium, and gains in bank mergers: The impact of managerial motivations," Working Papers 0004, College of Business, University of Texas at San Antonio.
    23. Du, Min & Boateng, Agyenim, 2015. "State ownership, institutional effects and value creation in cross-border mergers & acquisitions by Chinese firms," International Business Review, Elsevier, vol. 24(3), pages 430-442.

    More about this item

    JEL classification:

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

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