Understanding predictive information criteria for Bayesian models
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We review the Akaike, deviance, and Watanabe-Akaike information criteria from a Bayesian perspective, where the goal is to estimate expected out-of-sample-prediction error using a bias-corrected adjustment of within-sample error. We focus on the choices involved in setting up these measures, and we compare them in three simple examples, one theoretical and two applied. The contribution of this paper is to put all these information criteria into a Bayesian predictive context and to better understand, through small examples, how these methods can apply in practice.
KeywordsAIC DIC WAIC Cross-validation Prediction Bayes
We thank two reviewers for helpful comments and the National Science Foundation, Institute of Education Sciences, and Academy of Finland (grant 218248) for partial support of this research.
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