Estimating Ambiguity Aversion in a Portfolio Choice Experiment

David Ahn, Syngjoo Choi, Douglas Gale (douglas.gale@nyu.edu) and Shachar Kariv
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David Ahn: University of CA, Berkeley
Shachar Kariv: University of CA, Berkeley

Working Papers from University of Pennsylvania, Wharton School, Weiss Center

Abstract: We report a portfolio-choice experiment that enables us to estimate parametric models of ambiguity aversion at the level of the individual subject. The assets are Arrow securities corresponding to three states of nature, where one state is risky with known probability and two states are ambiguous with unknown probabilities. We estimate two specifications of ambiguity aversion, one kinked and one smooth that encompass many of the theoretical models in the literature. Each specification includes two parameters: one for ambiguity attitudes and another for risk attitudes. We also estimate a three-parameter specification that includes an additional parameter for pessimism/optimism (underweighting/overweighting the probabilities of different payoffs). The parameter estimates for individual subjects exhibit considerable heterogeneity. We cannot reject the null hypothesis of Subjective Expected Utility for a majority of subjects. Most of the remaining subjects exhibit statistically significant ambiguity aversion or seeking and/or pessimism or optimism.

JEL-codes: C91 D81 (search for similar items in EconPapers)
Date: 2013-06
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Citations: View citations in EconPapers (3)

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Related works:
Journal Article: Estimating ambiguity aversion in a portfolio choice experiment (2014)
Working Paper: Estimating Ambiguity Aversion in a Portfolio Choice Experiment (2009)
Working Paper: Estimating Ambiguity Aversion in a Portfolio Choice Experiment (2008)
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