Crowdsourcing SCOTUS Paper Presentation at University of Minnesota Law School

The next leg of our SCOTUS Crowdsourcing Tour takes us to Minneapolis – for talk at the University of Minnesota Law School.  Looking forward to it!

Crowdsourcing Accurately and Robustly Predicts Supreme Court Decisions – Professors Daniel Martin Katz, Michael Bommarito & Josh Blackman

Today Michael J Bommarito II and I were live in Ann Arbor at the University of Michigan Center for Political Studies to kickoff the tour for our #SCOTUS Crowd Prediction Paperhere is version 1.01 of the slide deck

Crowdsourcing Accurately and Robustly Predicts Supreme Court Decisions — By Daniel Martin Katz, Michael Bommarito, Josh Blackman – via SSRN)

ABSTRACT:  Scholars have increasingly investigated “crowdsourcing” as an alternative to expert-based judgment or purely data-driven approaches to predicting the future. Under certain conditions, scholars have found that crowd-sourcing can outperform these other approaches. However, despite interest in the topic and a series of successful use cases, relatively few studies have applied empirical model thinking to evaluate the accuracy and robustness of crowdsourcing in real-world contexts. In this paper, we offer three novel contributions. First, we explore a dataset of over 600,000 predictions from over 7,000 participants in a multi-year tournament to predict the decisions of the Supreme Court of the United States. Second, we develop a comprehensive crowd construction framework that allows for the formal description and application of crowdsourcing to real-world data. Third, we apply this framework to our data to construct more than 275,000 crowd models. We find that in out-of-sample historical simulations, crowdsourcing robustly outperforms the commonly-accepted null model, yielding the highest-known performance for this context at 80.8% case level accuracy. To our knowledge, this dataset and analysis represent one of the largest explorations of recurring human prediction to date, and our results provide additional empirical support for the use of crowdsourcing as a prediction method.  (via SSRN)

Abnormal Returns and SCOTUS – or – The Supreme Court Considers a Sports Gambling Case

We have a paper on Abnormal Returns and Supreme Court decision making – this looks like a prime candidate for casino stocks, etc. (not a guarantee but a real possibility)  — if only we had the technology to predict Supreme Court cases using methods such as crowds and algorithms    🙂

Fantasy Justice by LexPredict Final Vote Tally (via

For the past few weeks we have been running Fantasy Justice – an online prediction tournament organized by our company LexPredict – Gorsuch stormed to the lead in late November and has been in first place ever since – Hardiman has made a late surge but the vast majority of votes are for Gorsuch … we will see tonight where it lands …

The Three Forms of (Legal) Prediction: Experts, Crowds + Algorithms (Updated Version of Presentation)