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Researchers predict SCOTUS decisions with improved accuracy

April 13, 2017

In a paper in the peer-reviewed science journal PLOS ONE, Chicago-Kent professor Daniel Martin Katz, Chicago-Kent researcher Michael J. Bommarito II, and Professor Josh Blackman of South Texas College of Law Houston construct a model that predicts with more than 70 percent accuracy the votes and case outcomes of the United States Supreme Court.

Justice-term accuracy heatmap compared against M = 10 null model (1915 -2015). Justice-term accuracy heatmap compared against
M = 10 null model (1915 -2015).

The prediction model utilizes a time-evolving, random-forest classifer, which is an algorithm for modeling data based on decision trees. The authors used the model to predict more than 240,000 justice votes and 28,000 case outcomes spanning the years 1816 to 2015.

The article, titled A General Approach for Predicting the Behavior of the Supreme Court of the United States, was published April 12, 2017, in PLOS ONE.

The new model developed by the authors improves on the general level of prediction achieved by prior work and is the only existing model applicable to the entire past and future of the court rather than a single term. The model outperforms a range of baseline models including one null model that is optimized using in-sample information.

"Our results represent an important advance for the science of quantitative legal prediction and portend a range of other potential applications," said Professor Katz.

Professor Daniel Martin Katz is a scientist, technologist and legal scholar who applies an innovative polytechnic approach to teaching law. He directs The Law Lab @ Illinois Tech - Chicago Kent-College of Law. Both his scholarship and teaching integrate science, technology, engineering and mathematics. He teaches Civil Procedure, E-Discovery, Legal Analytics and Practice & Professionalism at Chicago-Kent and spearheads new initiatives to teach law students how to leverage technology and entrepreneurship in their future legal careers.

Michael J. Bommarito II is the head of research at The Law Lab @ Chicago-Kent, a premier, interdisciplinary teaching and research center focused on legal innovation and technology.

Professor Josh Blackman, a faculty member at South Texas College of Law Houston, focuses his scholarship on constitutional law, the United States Supreme Court, and the intersection of law and technology.

Founded in 1888, Chicago-Kent College of Law is the law school of Illinois Institute of Technology, also known as Illinois Tech, a private, technology-focused, research university offering undergraduate and graduate degrees in engineering, science, architecture, business, design, human sciences, applied technology, and law.

For More Information:

Jacqueline A. Seaberg
Office of Public Affairs
jseaberg@kentlaw.iit.edu
(312) 906-5257