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Event Study Testing with Cross-sectional Correlation of Abnormal Returns

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  • James W. Kolari
  • Seppo Pynnönen
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    Abstract

    This article examines the issue of cross-sectional correlation in event studies. When there is event-date clustering, we find that even relatively low cross-correlation among abnormal returns is serious in terms of over-rejecting the null hypothesis of zero average abnormal returns. We propose a new test statistic that modifies the t-statistic of Boehmer, Musumeci, and Poulsen (1991) to take into account cross-correlation and show that it performs well in competition with others, including the portfolio approach, which is less powerful than other alternatives under study. Also, our statistic is readily useable to test multiple-day cumulative abnormal returns. The Author 2010. Published by Oxford University Press on behalf of The Society for Financial Studies. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org., Oxford University Press.

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    Bibliographic Info

    Article provided by Society for Financial Studies in its journal Review of Financial Studies.

    Volume (Year): 23 (2010)
    Issue (Month): 11 (November)
    Pages: 3996-4025

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    Handle: RePEc:oup:rfinst:v:23:y:2010:i:11:p:3996-4025

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    Cited by:
    1. Oberndorfer, Ulrich & Schmidt, Peter & Wagner, Marcus & Ziegler, Andreas, 2013. "Does the stock market value the inclusion in a sustainability stock index? An event study analysis for German firms," Journal of Environmental Economics and Management, Elsevier, vol. 66(3), pages 497-509.
    2. Lulu Gu & W. Robert Reed, 2012. "Information Asymmetry, Market Segmentation and Cross-Listing: Implicatons for Event Study Methodology," Working Papers in Economics 12/08, University of Canterbury, Department of Economics and Finance.
    3. Fiordelisi, Franco & Galloppo, Giuseppe & Ricci, Ornella, 2014. "The effect of monetary policy interventions on interbank markets, equity indices and G-SIFIs during financial crisis," Journal of Financial Stability, Elsevier, vol. 11(C), pages 49-61.
    4. Bosma, Jakob & Koetter, Michael & Wedow, Michael, 2012. "Credit risk connectivity in the financial industry and stabilization effects of government bailouts," Discussion Papers 16/2012, Deutsche Bundesbank, Research Centre.
    5. Amici, Alessandra & Fiordelisi, Franco & Masala, Francesco & Ricci, Ornella & Sist, Federica, 2013. "Value creation in banking through strategic alliances and joint ventures," Journal of Banking & Finance, Elsevier, vol. 37(5), pages 1386-1396.
    6. Estelle P. Dauchy & Sebastien Bradley & Makoto Hasegawa, 2013. "Investor Valuations of Japan's Adoption of a Territorial Tax Regime: Quantifying the Direct and Competitive Effects of International Tax Reform," Working Papers w0201, Center for Economic and Financial Research (CEFIR).
    7. Berg, Florian & Le Pen, Yannick, 2013. "Do corporate bond and credit default swap markets value environmental, social or corporate governance events?," Economics Papers from University Paris Dauphine 123456789/11380, Paris Dauphine University.
    8. Elyasiani, Elyas & Mester, Loretta J. & Pagano, Michael S., 2014. "Large capital infusions, investor reactions, and the return and risk-performance of financial institutions over the business cycle," Journal of Financial Stability, Elsevier, vol. 11(C), pages 62-81.
    9. Lehmann, Sibylle H. & Hauber, Philipp & Opitz, Alexander, 2012. "Political rights, taxation, and firm valuation: Evidence from Saxony around 1900," FZID Discussion Papers 59-2012, University of Hohenheim, Center for Research on Innovation and Services (FZID).
    10. Petrella, Giovanni & Resti, Andrea, 2013. "Supervisors as information producers: Do stress tests reduce bank opaqueness?," Journal of Banking & Finance, Elsevier, vol. 37(12), pages 5406-5420.
    11. Elyas Elyasiani & Loretta J. Mester & Michael S. Pagano, 2011. "Large capital infusions, investor reactions, and the return and risk performance of financial institutions over the business cycle and recent finanical crisis," Working Papers 11-46, Federal Reserve Bank of Philadelphia.
    12. Uhde, Andre & Farruggio, Christian & Michalak, Tobias C., 2013. "The light and dark side of TARP," Annual Conference 2013 (Duesseldorf): Competition Policy and Regulation in a Global Economic Order 80004, Verein für Socialpolitik / German Economic Association.
    13. Fratianni, Michele & Marchionne, Francesco, 2013. "The fading stock market response to announcements of bank bailouts," Journal of Financial Stability, Elsevier, vol. 9(1), pages 69-89.
    14. Peter S. Schmidt & Therese Werner, 2012. "Channeling the final Say in Politics," CER-ETH Economics working paper series 12/165, CER-ETH - Center of Economic Research (CER-ETH) at ETH Zurich.
    15. Matteo Pelagatti, 2013. "Nonparametric tests for event studies under cross-sectional dependence," Working Papers 244, University of Milano-Bicocca, Department of Economics, revised May 2013.
    16. Chan, Kalok & Kot, Hung Wan & Tang, Gordon Y.N., 2013. "A comprehensive long-term analysis of S&P 500 index additions and deletions," Journal of Banking & Finance, Elsevier, vol. 37(12), pages 4920-4930.

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