A Caltech Library Service

Functional EWA: A One-parameter Theory of Learning in Games

Camerer, Colin F. and Ho, Teck H. and Chong, Juin-Kuan (2002) Functional EWA: A One-parameter Theory of Learning in Games. California Institute of Technology , Pasadena, CA. (Unpublished)

[img] PDF - Submitted Version
See Usage Policy.


Use this Persistent URL to link to this item:


Functional experience weighted attraction (fEWA) is a one-parameter theory of learning in games. It approximates the free parameters in an earlier model (EWA) with functions of experience. The theory was originally tested on seven different games and compared to four other learning and equilibrium theories, then three more games were added. Generally fEWA or parameterized EWA predict best out-of-sample, but one kind of reinforcement learning predicts well in games with mixed-strategy equilibrium. Of the learning models, belief learning models fit worst but fit better than noisy (quantal response) equilibrium models. The economic value of a theory is measured by how much more subjects would have earned if they followed the theory's recommendations. Most learning theories add value (though equilibrium theories often subtract value) and fEWA and EWA usually add the most value.

Item Type:Report or Paper (Report)
Camerer, Colin F.0000-0003-4049-1871
Ho, Teck H.0000-0001-5210-4977
Chong, Juin-Kuan0000-0002-5187-8652
Additional Information:Thanks to participants in the 2000 Southern Economics Association meetings, the Wharton School Decision Processes Workshop, the University of Pittsburgh, the Berkeley Marketing Workshop, the Nobel Symposium on Behavioral and Experimental Economics (December 2001) and C. Mónica Capra, David Cooper, Vince Crawford, Ido Erev, Guillaume Frechette and two referees for comments.
Record Number:CaltechAUTHORS:20160303-102558354
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:65003
Deposited By: Katherine Johnson
Deposited On:03 Mar 2016 18:26
Last Modified:03 Oct 2019 09:43

Repository Staff Only: item control page