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Do Case Outcomes Really Reveal Anything About the Legal System? Win Rates and Removal Jurisdiction


Kevin M. Clermont


Cornell Law School

Theodore Eisenberg


Cornell University - Law School


Cornell Law Review, Vol. 83, p. 581, 1998

Abstract:     
Many empirical legal studies use data on plaintiffs' rate of success, because of those data's ready availability and apparent import. Yet these win rates are probably the slipperiest of all judicial data. Win rates are inherently ambiguous because of the case-selection effect. The litigants' selection of the cases brought produces a biased sample from the mass of underlying disputes. The settlement process, usually conducted by rational and knowledgeable persons who take into account and thereby neutralize the very factor that one would like to study, produces a residue of litigated cases for which the win rate might indicate nothing more than the percentage of successful plaintiffs in this peculiar and nonrandom sample of cases. Nevertheless, careful research and theorizing can sometimes tease out an explanation of win-rate data by isolating case-selection effects to reveal meaningful non-case-selection effects, such as the effect of the forum chosen. This artful process of win-rate explanation involves controlling for and otherwise investigating other variables to see which of the possible explanations conform to the additional evidence, and then applying a plausibility screen to the surviving explanations.

Plaintiffs' win rates in removed cases are very low, compared to cases brought originally in federal court and to state cases. For example, the win rate in original diversity cases is 71%, but in removed diversity cases it is only 34%. In a regression controlling for many case variables, this removal effect remains sizable and significant. The explanation for this phenomenon could be the ready one based on the purpose of removal: by defeating the plaintiffs' forum advantage, defendants thereby shift the biases, inconveniences, court quality, and procedural law in their own favor. Alternatively, the explanation might lie not in forum impact, but instead in case selection: removed cases may simply be a set of weak cases involving (i) out-of-state defendants who have satisfied or settled all but plaintiffs' weakest cases or (ii) plaintiffs' attorneys who have demonstrated their incompetence by already exposing their clients to removal. Our analysis suggests that both case selection and forum impact are at work. Thus, forum really does affect outcome, with the removal process taking the defendant to a much more favorable forum.

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Date posted: November 13, 1998  

Suggested Citation

Clermont, Kevin M. and Eisenberg, Theodore, Do Case Outcomes Really Reveal Anything About the Legal System? Win Rates and Removal Jurisdiction. Cornell Law Review, Vol. 83, p. 581, 1998. Available at SSRN: http://ssrn.com/abstract=139651

Contact Information

Kevin M. Clermont (Contact Author)
Cornell Law School ( email )
Myron Taylor Hall
Ithaca, NY 14853
United States
607-255-5189 (Phone)
607-255-7193 (Fax)
Theodore Eisenberg
Cornell University - Law School ( email )
524 College Ave
Myron Taylor Hall
Ithaca, NY 14853
United States
607-255-6477 (Phone)
607-255-7193 (Fax)
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