4.3 Article

Outlier-Robust Bayesian Multinomial Choice Modeling

Journal

JOURNAL OF APPLIED ECONOMETRICS
Volume 31, Issue 7, Pages 1445-1466

Publisher

WILEY
DOI: 10.1002/jae.2482

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Funding

  1. Ghent University
  2. Hercules Foundation
  3. Flemish Government

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A Bayesian method for outlier-robust estimation of multinomial choice models is presented. The method can be used for both correlated as well as uncorrelated choice alternatives and guarantees robustness towards outliers in the dependent and independent variables. To account for outliers in the response direction, the fat-tailed multivariate Laplace distribution is used. Leverage points are handled via a shrinkage procedure. A simulation study shows that estimation of the model parameters is less influenced by outliers compared to non-robust alternatives. An analysis of margarine scanner data shows how our method can be used for better pricing decisions. Copyright (c) 2015 John Wiley & Sons, Ltd.

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