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An Evaluation of Testing Procedures for Long Horizon Event Studies

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  • James S. Ang
  • Shaojun Zhang

Abstract

We conduct a comprehensive simulation study to evaluate testing procedures for long horizon event studies. The simulation results raise the following concerns about some popular practices: (1) using the four-factor model that includes the Fama-French three factors and a momentum-related factor causes serious over rejection of the null hypothesis; (2) using reference portfolios as benchmark tends to overestimate event firms' long-term returns; and (3) the computation-intensive bootstrap test has low power for long event horizons. Moreover, unless the number of event firms in a study is very large, all testing procedures suffer substantial loss of power quickly as event horizon increases, especially for samples of small firms. Of particular interest, the combination of the nonparametric sign test with a single firm benchmark shows the best performance consistently in our simulations.

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  • James S. Ang & Shaojun Zhang, 2004. "An Evaluation of Testing Procedures for Long Horizon Event Studies," Review of Quantitative Finance and Accounting, Springer, vol. 23(3), pages 251-274, November.
    • Handle: RePEc:kap:rqfnac:v:23:y:2004:i:3:p:251-274
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    Cited by:

    1. Sorokina, Nonna & Thornton, John H., 2016. "Reactions of equity markets to recent financial reforms," Journal of Economics and Business, Elsevier, vol. 87(C), pages 50-69.
    2. Pawel Bilinski & Norman Strong, 2013. "Managers’ Private Information, Investor Underreaction and Long†Run SEO Performance," European Financial Management, European Financial Management Association, vol. 19(5), pages 956-990, November.
    3. Ronald Bremer & Bonnie Buchanan & Philip English, 2011. "The advantages of using quarterly returns for long-term event studies," Review of Quantitative Finance and Accounting, Springer, vol. 36(4), pages 491-516, May.
    4. Alan Gregory & Rajesh Tharyan & Ian Tonks, 2013. "More than Just Contrarians: Insider Trading in Glamour and Value Firms," European Financial Management, European Financial Management Association, vol. 19(4), pages 747-774, September.
    5. Christina Dargenidou & Alan Gregory & Shan Hua, 2016. "How far does financial reporting allow us to judge whether M&A activity is successful?," Accounting and Business Research, Taylor & Francis Journals, vol. 46(5), pages 467-499, August.
    6. Gunturu, Vamsi Krishna & Abidi, Qambar, 2023. "A study on impact of IBC," MPRA Paper 116850, University Library of Munich, Germany.
    7. Michael Cichello & Douglas Lamdin, 2006. "Event Studies and the Analysis of Antitrust," International Journal of the Economics of Business, Taylor & Francis Journals, vol. 13(2), pages 229-245.
    8. Wijayana, Singgih & Gray, Sidney J., 2018. "Capital market consequences of cultural influences on earnings: The case of cross-listed firms in the U.S. stock market," International Review of Financial Analysis, Elsevier, vol. 57(C), pages 134-147.
    9. Philip Brown & Andrew Ferguson & Kate Stone, 2008. "Share Purchase Plans in Australia: Issuer Characteristics and Valuation Implications," Australian Journal of Management, Australian School of Business, vol. 33(2), pages 307-332, December.
    10. Kam Chan & Yung Lo, 2011. "Credit ratings and long-term IPO performance," Journal of Economics and Finance, Springer;Academy of Economics and Finance, vol. 35(4), pages 473-483, October.

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