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arXiv 2103.01252stat.ME
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具有影响性观测值的经验贝叶斯模型平均:调整Zellner的g先验以获得预测鲁棒性

Empirical Bayes Model Averaging with Influential Observations: Tuning Zellner's g Prior for Predictive Robustness

Christopher M. Hans, Mario Peruggia, Junyan Wang

摘要:

研究了正态线性回归模型在存在影响性观测值时的贝叶斯模型平均(BMA)行为。补救措施,以减轻潜在的负面影响,这种意见的推断和预测。该方法的动机是认为表现良好的残差和良好的预测性能往往是齐头并进的。重点放在使用Zellner的g先验变量的回归模型上。在简单的情况下,研究各种形式的模型失配对BMA预测的影响,指出了在获得最佳预测之前“调整”Zellner g的规定性指导方针。先验分布的调整是通过考虑BMA系综中各种模型的最佳拟合所应享有的理论性质来获得的。该方法可以被认为是一种“经验贝叶斯”建模方法,因为数据有助于告知先验的规范,以减轻有影响力的案例的负面影响。

英文摘要:

The behavior of Bayesian model averaging (BMA) for the normal linear regression model in the presence of influential observations that contribute to model misfit is investigated. Remedies to attenuate the potential negative impacts of such observations on inference and prediction are proposed. The methodology is motivated by the view that well-behaved residuals and good predictive performance often go hand-in-hand. Focus is placed on regression models that use variants on Zellner's g prior. Studying the impact of various forms of model misfit on BMA predictions in simple situations points to prescriptive guidelines for "tuning" Zellner's g prior to obtain optimal predictions. The tuning of the prior distribution is obtained by considering theoretical properties that should be enjoyed by the optimal fits of the various models in the BMA ensemble. The methodology can be thought of as an "empirical Bayes" approach to modeling, as the data help to inform the specification of the prior in an attempt to attenuate the negative impact of influential cases.

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