Bayesian and conditional frequentist testing of a parametric model versus nonparametric alternatives

Journal Article (Journal Article)

Testing the fit of data to a parametric model can be done by embedding the parametric model in a nonparametric alternative and computing the Bayes factor of the parametric model to the nonparametric alternative. Doing so by specifying the nonparametric alternative via a Polya tree process is particularly attractive, from both theoretical and methodological perspectives. Among the benefits is a degree of computational simplicity that even allows for robustness analyses to be implemented. Default (nonsubjective) versions of this analysis are developed herein, in the sense that recommended choices are provided for the (many) features of the Polya tree process that need to be specified. Considerable discussion of these features is also provided to assist those who might be interested in subjective choices. A variety of examples involving location–scale models are studied. Finally, it is shown that the resulting procedure can be viewed as a conditional frequentist test, resulting in data-dependent reported error probabilities that have a real frequentist interpretation (as opposed to p values) in even small sample situations. © 2001 American Statistical Association.

Full Text

Duke Authors

Cited Authors

  • Berger, JO; Guglielmi, A

Published Date

  • March 1, 2001

Published In

Volume / Issue

  • 96 / 453

Start / End Page

  • 174 - 184

Electronic International Standard Serial Number (EISSN)

  • 1537-274X

International Standard Serial Number (ISSN)

  • 0162-1459

Digital Object Identifier (DOI)

  • 10.1198/016214501750333045

Citation Source

  • Scopus