arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2009.09248stat.MEmath.STstat.TH
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后验平均信息准则

Posterior Averaging Information Criterion

Shouhao Zhou

摘要:

本文提出了一种新的模型选择方法--后验平均信息准则,从预测的角度对贝叶斯模型进行评估。理论基础是建立在库尔贝克-莱布勒散度上的,以量化所提出的候选模型和底层真实模型之间的相似性。从贝叶斯的角度来看,我们的方法在预测未来的独立观察方面,在整个后验分布上评估候选模型。在不假设真实分布包含在候选模型中的情况下,通过校正对数似然的后验均值相对于其预期对数似然的渐近偏差来开发新的标准。它可以普遍适用于贝叶斯模型与退化的非信息先验。在正态和二项设置下的模拟都显示出良好的小样本性能。

英文摘要:

We propose a new model selection method, the posterior averaging information criterion, for Bayesian model assessment from a predictive perspective. The theoretical foundation is built on the Kullback-Leibler divergence to quantify the similarity between the proposed candidate model and the underlying true model. From a Bayesian perspective, our method evaluates the candidate models over the entire posterior distribution in terms of predicting a future independent observation. Without assuming that the true distribution is contained in the candidate models, the new criterion is developed by correcting the asymptotic bias of the posterior mean of the log-likelihood against its expected log-likelihood. It can be generally applied even for Bayesian models with degenerate non-informative prior. The simulation in both normal and binomial settings demonstrates decent small sample performance.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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