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The Statistical Analysis of Judicial Decisions and Legal Rules with Classification Trees

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  • Jonathan P. Kastellec

Abstract

A key question in the quantitative study of legal rules and judicial decision making is the structure of the relationship between case facts and case outcomes. Legal doctrine and legal rules are general attempts to define this relationship. This article summarizes and utilizes a statistical method relatively unexplored in political science and legal scholarship—classification trees—that offers a flexible way to study legal doctrine. I argue that this method, while not replacing traditional statistical tools for studying judicial decisions, can better capture many aspects of the relationship between case facts and case outcomes. To illustrate the method's advantages, I conduct classification tree analyses of search and seizure cases decided by the U.S. Supreme Court and confession cases decided by the courts of appeals. These analyses illustrate the ability of classification trees to increase our understanding of legal rules and legal doctrine.

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  • Jonathan P. Kastellec, 2010. "The Statistical Analysis of Judicial Decisions and Legal Rules with Classification Trees," Journal of Empirical Legal Studies, John Wiley & Sons, vol. 7(2), pages 202-230, June.
    • Handle: RePEc:wly:empleg:v:7:y:2010:i:2:p:202-230
    DOI: 10.1111/j.1740-1461.2010.01176.x
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    References listed on IDEAS

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    Cited by:

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    2. Bernd Hayo & Stefan Voigt, 2014. "Mapping Constitutionally Safeguarded Judicial Independence—A Global Survey," Journal of Empirical Legal Studies, John Wiley & Sons, vol. 11(1), pages 159-195, March.

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