The Deviance Information Criterion (DIC) is a statistical tool used for model selection in the context of Bayesian statistics. It is specifically designed for hierarchical models and is particularly useful when comparing models with different complexities. The DIC is composed of two main components: 1. **Deviance**: This is a measure of how well a model fits the data.
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For Bayesian deviance under a common likelihood convention, define and . Then trades average fit against effective complexity. Lower values suggest better penalized predictive fit in comparable models; differences are not Bayes factors or model posterior probabilities. The choice of stochastic parameters and latent-variable representation matters, especially in a hierarchical Bayesian model.