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arXiv 2008.06213stat.ME
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基于局部自适应样条的可加部分线性模型的贝叶斯模型选择

Bayesian model selection in additive partial linear models via locally adaptive splines

Seonghyun Jeong, Taeyoung Park, David A. van Dyk

摘要:

我们提供了一个灵活的框架中选择一类添加剂部分线性模型,允许线性和非线性添加剂成分。在实践中,它是具有挑战性的,以确定哪些添加剂成分应被排除在模型,同时确定是否非零添加剂成分应表示为线性或非线性成分在最终的模型。在本文中,我们提出了一种贝叶斯模型选择方法,该方法通过仔细指定的一类模型来实现,包括先验分布的选择和用于非线性添加剂成分的非参数模型。我们采用了一系列的潜变量,确定每个变量之间的三种可能性(无影响,线性效应,非线性效应)的影响,并同时确定每个样条的结的一个合适的惩罚光滑的功能。使用伪先验分布以及折叠方案使我们能够部署性能良好的马尔可夫链蒙特卡罗采样器,用于模型选择和拟合优选模型。我们的方法和算法部署在一套数值研究,并应用于营养流行病学研究。数值结果表明,所提出的方法优于以前可用的方法的有效样本量的马尔可夫链采样器和整体的错误分类率。

英文摘要:

We provide a flexible framework for selecting among a class of additive partial linear models that allows both linear and nonlinear additive components. In practice, it is challenging to determine which additive components should be excluded from the model while simultaneously determining whether nonzero additive components should be represented as linear or non-linear components in the final model. In this paper, we propose a Bayesian model selection method that is facilitated by a carefully specified class of models, including the choice of a prior distribution and the nonparametric model used for the nonlinear additive components. We employ a series of latent variables that determine the effect of each variable among the three possibilities (no effect, linear effect, and nonlinear effect) and that simultaneously determine the knots of each spline for a suitable penalization of smooth functions. The use of a pseudo-prior distribution along with a collapsing scheme enables us to deploy well-behaved Markov chain Monte Carlo samplers, both for model selection and for fitting the preferred model. Our method and algorithm are deployed on a suite of numerical studies and are applied to a nutritional epidemiology study. The numerical results show that the proposed methodology outperforms previously available methods in terms of effective sample sizes of the Markov chain samplers and the overall misclassification rates.

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