Bayesian Nonparametric Modeling for Multivariate Ordinal Regression
Bayesian Nonparametric Modeling for Multivariate Ordinal Regression
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DOI：
10.1080/10618600.2017.1316280
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发表时间：
2018-01-01
影响因子：
2.4
通讯作者：
Kottas, Athanasios
中科院分区：
文献类型：
--
作者：
DeYoreo, Maria;Kottas, Athanasios
通常假设单变量或多变量有序响应来自潜在连续参数分布，协变量效应线性进入。本文介绍了一种单变量和多变量有序回归的贝叶斯非参数建模方法，该方法基于潜在响应和协变量的联合分布的混合建模。建模框架可以高度灵活地推断有序回归关系，避免协变量效应中的线性或加性假设。在标准参数有序回归模型中，计算挑战来自于可识别性约束和需要非标准推理技术的参数估计。非参数模型的一个关键特征是它实现了推理的灵活性，同时避免了这些困难。特别是，我们建立了充分支持的非参数混合模型下的固定截止点，通过离散化的潜在连续响应与顺序响应。通过应用到两个数据集的计量经济学，一个例子，涉及臭氧浓度的回归关系，和多评价协议问题的建模方法的实际效用说明。补充材料与技术细节的理论结果和计算可在线。
Univariate or multivariate ordinal responses are often assumed to arise from a latent continuous parametric distribution, with covariate effects that enter linearly. We introduce a Bayesian nonparametric modeling approach for univariate and multivariate ordinal regression, which is based on mixture modeling for the joint distribution of latent responses and covariates. The modeling framework enables highly flexible inference for ordinal regression relationships, avoiding assumptions of linearity or additivity in the covariate effects. In standard parametric ordinal regression models, computational challenges arise from identifiability constraints and estimation of parameters requiring nonstandard inferential techniques. A key feature of the nonparametric model is that it achieves inferential flexibility, while avoiding these difficulties. In particular, we establish full support of the nonparametric mixture model under fixed cut-off points that relate through discretization the latent continuous responses with the ordinal responses. The practical utility of the modeling approach is illustrated through application to two datasets from econometrics, an example involving regression relationships for ozone concentration, and a multirater agreement problem. Supplementary materials with technical details on theoretical results and on computation are available online.