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American Economic Review Vol. 109 No. 12 2019

Predicting and Understanding Initial Play

Drew Fudenberg1; Annie Liang2

1 Department of Economics, MIT, 77 Massachusetts Avenue, Cambridge, MA 02139 (email: ) · 2 Department of Economics, University of Pennsylvania, 133 South 36th Street, Philadelphia, PA 19104 (email: )

open access

Abstract

We use machine learning to uncover regularities in the initial play of matrix games. We first train a prediction algorithm on data from past experiments. Examining the games where our algorithm predicts correctly, but existing economic models don’t, leads us to add a parameter to the best performing model that improves predictive accuracy. We then observe play in a collection of new “ algorithmically generated” games, and learn that we can obtain even better predictions with a hybrid model that uses a decision tree to decide game-by-game which of two economic models to use for prediction.

DOI
10.1257/aer.20180654
Volume
109
Issue
12
Pages
4112-4141
Language
en
Sources
bibtex:phds-export.bib openalex crossref

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