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arXiv 1207.5378math.STstat.TH
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分位数回归的贝叶斯经验似然

Bayesian empirical likelihood for quantile regression

Yunwen Yang, Xuming He

摘要:

贝叶斯推理提供了一种将数据与先验信息相结合的灵活方法。然而,分位数回归不具备参数似然性,因此,分位数回归的贝叶斯推断需要仔细研究。本文考虑分位数回归的贝叶斯经验似然方法。将经验似然性纳入贝叶斯框架,我们证明了任何固定先验的后验概率是渐近正态的;其均值向真实参数值收缩,其方差接近最大经验似然估计量。一个更有趣的情况下,可以为贝叶斯经验似然信息先验被用来探索跨分位数的共性。在每个百分位数水平上单独计算的回归分位数往往在数据稀疏区域(例如,高或低百分位数水平)。通过经验的可能性,所提出的方法使我们能够探索各种形式的共性跨分位数的效率增益。通过在计算中使用MCMC算法,我们避免了直接最大化经验可能性的艰巨任务。经验研究所提出的方法的有限样本性能,其中大量的效率增益证明了在几个百分点水平上的共同特征的信息先验。收缩先验的理论框架中使用的文件,以更好地理解所提出的方法的力量。

英文摘要:

Bayesian inference provides a flexible way of combining data with prior information. However, quantile regression is not equipped with a parametric likelihood, and therefore, Bayesian inference for quantile regression demands careful investigation. This paper considers the Bayesian empirical likelihood approach to quantile regression. Taking the empirical likelihood into a Bayesian framework, we show that the resultant posterior from any fixed prior is asymptotically normal; its mean shrinks toward the true parameter values, and its variance approaches that of the maximum empirical likelihood estimator. A more interesting case can be made for the Bayesian empirical likelihood when informative priors are used to explore commonality across quantiles. Regression quantiles that are computed separately at each percentile level tend to be highly variable in the data sparse areas (e.g., high or low percentile levels). Through empirical likelihood, the proposed method enables us to explore various forms of commonality across quantiles for efficiency gains. By using an MCMC algorithm in the computation, we avoid the daunting task of directly maximizing empirical likelihood. The finite sample performance of the proposed method is investigated empirically, where substantial efficiency gains are demonstrated with informative priors on common features across several percentile levels. A theoretical framework of shrinking priors is used in the paper to better understand the power of the proposed method.

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