Spiegelhalter, David J.; Best, Nicola G.; Carlin, Bradley P.; van der Linde, Angelika Bayesian measures of model complexity and fit (with discussion). (English) Zbl 1067.62010 J. R. Stat. Soc., Ser. B, Stat. Methodol. 64, No. 4, 583-639 (2002). Summary: We consider the problem of comparing complex hierarchical models in which the number of parameters is not clearly defined. Using an information theoretic argument we derive a measure \(p_D\) for the effective number of parameters in a model as the difference between the posterior mean of the deviance and the deviance at the posterior means of the parameters of interest. In general, \(p_D\) approximately corresponds to the trace of the product of Fisher’s information and the posterior covariance, which in normal models is the trace of the ‘hat’ matrix projecting observations onto fitted values. Its properties in exponential families are explored. The posterior mean deviance is suggested as a Bayesian measure of fit or adequacy, and the contributions of individual observations to the fit and complexity can give rise to a diagnostic plot of deviance residuals against leverages. Adding \(p_D\) to the posterior mean deviance gives a deviance information criterion for comparing models, which is related to other information criteria and has an approximate decision theoretic justification. The procedure is illustrated in some examples, and comparisons are drawn with alternative Bayesian and classical proposals. Throughout it is emphasized that the quantities required are trivial to compute in a Markov chain Monte Carlo analysis. Cited in 12 ReviewsCited in 1182 Documents MSC: 62C10 Bayesian problems; characterization of Bayes procedures 62B10 Statistical aspects of information-theoretic topics 62F15 Bayesian inference 62A01 Foundations and philosophical topics in statistics Keywords:Bayesian model comparison; deviance information criterion; effective number of parameters; hierarchical models; leverage; Markov chain Monte Carlo methods; model dimension PDF BibTeX XML Cite \textit{D. J. Spiegelhalter} et al., J. R. Stat. Soc., Ser. B, Stat. Methodol. 64, No. 4, 583--639 (2002; Zbl 1067.62010) Full Text: DOI References: [1] Akaike H., Proc. 2nd Int. Symp. Information Theory pp 267– (1973) [2] Andrews D. F., J. R. Statist. Soc. 36 pp 99– (1974) [3] Berk R. H., Ann. Math. Statist. 37 pp 51– (1966) [4] Bernardo J. M., Ann. Statist. 7 pp 686– (1979) [5] Bernardo J. M., Bayesian Theory (1994) [6] Besag J., J. R. Statist. Soc. 36 pp 192– (1974) [7] DOI: 10.1191/147108201128168 · Zbl 1104.62023 [8] Box G. E. P., J. Am. 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