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arXiv 1111.0317stat.MEstat.AP
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混合数据的贝叶斯高斯Copula因子模型

Bayesian Gaussian Copula Factor Models for Mixed Data

Jared S. Murray, David B. Dunson, Lawrence Carin, Joseph E. Lucas

摘要:

高斯因子模型已被证明是非常有用的吝啬特征的依赖性在多变量数据。有丰富的文献,他们的扩展到混合的分类和连续变量,使用潜在的高斯变量或通过广义的潜在特质模型commodating测量指数家庭。然而,当推广到非高斯测量变量时,潜在变量通常会影响依赖结构和边缘分布的形式,使解释复杂化并引入伪影。为了解决这个问题,我们提出了一类新的贝叶斯高斯copula因子模型,解耦的潜在因素的边缘分布。基于扩展秩似然的边缘的半参数规范产生简单的实现和大量的计算增益,对于扩展到高维应用程序至关重要。我们提供了新的理论和经验的理由使用这种可能性在贝叶斯推断。我们提出了新的默认先验的因素加载和开发有效的参数扩展吉布斯抽样后验计算。该方法通过模拟评估,并应用于政治科学的数据集。本文中的方法在R包bfa中实现。

英文摘要:

Gaussian factor models have proven widely useful for parsimoniously characterizing dependence in multivariate data. There is a rich literature on their extension to mixed categorical and continuous variables, using latent Gaussian variables or through generalized latent trait models acommodating measurements in the exponential family. However, when generalizing to non-Gaussian measured variables the latent variables typically influence both the dependence structure and the form of the marginal distributions, complicating interpretation and introducing artifacts. To address this problem we propose a novel class of Bayesian Gaussian copula factor models which decouple the latent factors from the marginal distributions. A semiparametric specification for the marginals based on the extended rank likelihood yields straightforward implementation and substantial computational gains, critical for scaling to high-dimensional applications. We provide new theoretical and empirical justifications for using this likelihood in Bayesian inference. We propose new default priors for the factor loadings and develop efficient parameter-expanded Gibbs sampling for posterior computation. The methods are evaluated through simulations and applied to a dataset in political science. The methods in this paper are implemented in the R package bfa.

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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