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Valid Inference in Single-Firm, Single-Event Studies

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  • Jonah B. Gelbach
  • Eric Helland
  • Jonathan Klick

Abstract

Single-firm event studies play an important role in both scholarship and litigation despite the general invalidity of standard inference. We use a broad cross-section of 2000--2007 CRSP data and find that the standard approach performs poorly in terms of both Type I and Type II error rates. We discuss a simple-to-use alternative, the SQ test, based on sample quantiles of the empirical distribution of pre-event fitted excess returns, which has correct asymptotic Type I error rate. Results suggest that the test will be useful in studying the impact of firm-specific events such as regulation, anti-trust rulings, and corporate or securities litigation. Copyright 2013, Oxford University Press.

Suggested Citation

  • Jonah B. Gelbach & Eric Helland & Jonathan Klick, 2013. "Valid Inference in Single-Firm, Single-Event Studies," American Law and Economics Review, American Law and Economics Association, vol. 15(2), pages 495-541.
    • Handle: RePEc:oup:amlawe:v:15:y:2013:i:2:p:495-541
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    File URL: http://hdl.handle.net/10.1093/aler/aht009
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    Cited by:

    1. Jeffrey L. Hoopes & Daniel H. Reck & Joel Slemrod, 2015. "Taxpayer Search for Information: Implications for Rational Attention," American Economic Journal: Economic Policy, American Economic Association, vol. 7(3), pages 177-208, August.
    2. Guangdong Xu & Wenming Xu & Shudan Xu, 2018. "Does the establishment of the Ministry of Environmental Protection matter for addressing China’s pollution problems? Empirical evidence from listed companies," Economics of Governance, Springer, vol. 19(3), pages 195-224, August.
    3. Gabriel E Lade & C -Y Cynthia Lin Lawell & Aaron Smith, 2018. "Policy Shocks and Market-Based Regulations: Evidence from the Renewable Fuel Standard," American Journal of Agricultural Economics, Agricultural and Applied Economics Association, vol. 100(3), pages 707-731.
    4. Dongil Daniel Keum, 2023. "Managerial political power and the reallocation of resources in the internal capital market," Strategic Management Journal, Wiley Blackwell, vol. 44(2), pages 369-414, February.
    5. Andersen Martin & Bauhoff Sebastian, 2017. "The Share Price Effect of CVS Health’s Announcement to Stop Selling Tobacco: A Comparative Case Study Using Synthetic Controls," Forum for Health Economics & Policy, De Gruyter, vol. 20(1), pages 1-13, June.
    6. Oscar Bernal Diaz & Astrid Herinckx & Ariane Szafarz, 2014. "Which short-selling regulation is the least damaging to market efficiency? Evidence from Europe," Post-Print CEB, ULB -- Universite Libre de Bruxelles, vol. 37, pages 244-256, March.
    7. Saravana Jaikumar & Viswanath Pingali & Vineet Virmani, 2019. "Shareholders’ reaction to ethical image of sports teams: an event study in the Indian Premier League," DECISION: Official Journal of the Indian Institute of Management Calcutta, Springer;Indian Institute of Management Calcutta, vol. 46(4), pages 283-300, December.
    8. Doran, Colin & Stratmann, Thomas, 2021. "How does liability affect prices? Railroad sparks and timber," International Review of Law and Economics, Elsevier, vol. 66(C).
    9. Zeng, James Si, 2021. "Does regulation of defensive tactics with mandatory rules benefit shareholders? Evidence from event studies in China," International Review of Law and Economics, Elsevier, vol. 66(C).
    10. Günster, Andrea & van Dijk, Mathijs, 2016. "The impact of European antitrust policy: Evidence from the stock market," International Review of Law and Economics, Elsevier, vol. 46(C), pages 20-33.
    11. Xu, Wenming & Xu, Guangdong, 2020. "Understanding public enforcement of securities law in China: An empirical analysis of the enforcement actions of the CSRC and its regional offices against informational misconduct," International Review of Law and Economics, Elsevier, vol. 61(C).

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