arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2003.06416stat.ME
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VCBART:用于变系数的贝叶斯树

VCBART: Bayesian trees for varying coefficients

Sameer K. Deshpande, Ray Bai, Cecilia Balocchi, Jennifer E. Starling, Jordan Weiss

AI总结:

针对现有变系数模型难以处理多元效应修饰变量的问题,提出VCBART,利用贝叶斯加性回归树灵活估计协变量效应,在估计、不确定性量化和预测上优于现有方法,并通过两个案例验证了其有效性。

摘要:

线性变系数模型假设结果与协变量之间存在线性关系,其中协变量效应被建模为额外效应修饰变量的函数。尽管在统计学和计量经济学中有着长期的研究和使用历史,但最先进的变系数建模方法在处理多元效应修饰变量时,若不施加限制性的函数形式假设或进行计算密集的超参数调优,便无法适用。为此,我们引入了VCBART,它利用贝叶斯加性回归树(Bayesian Additive Regression Trees)灵活地估计变系数模型中的协变量效应。在简单的默认设置下,VCBART在协变量效应估计、不确定性量化和结果预测方面优于现有的变系数方法。我们通过两个案例研究展示了VCBART的实用性:一个研究晚年认知与社会经济地位指标之间的关联如何随年龄和社会人口统计学特征而变化,另一个估计城市犯罪的时间趋势如何在社区层面变化。实现VCBART的R包可在https://github.com/skdeshpande91/VCBART获取。

英文摘要:

The linear varying coefficient models posits a linear relationship between an outcome and covariates in which the covariate effects are modeled as functions of additional effect modifiers. Despite a long history of study and use in statistics and econometrics, state-of-the-art varying coefficient modeling methods cannot accommodate multivariate effect modifiers without imposing restrictive functional form assumptions or involving computationally intensive hyperparameter tuning. In response, we introduce VCBART, which flexibly estimates the covariate effect in a varying coefficient model using Bayesian Additive Regression Trees. With simple default settings, VCBART outperforms existing varying coefficient methods in terms of covariate effect estimation, uncertainty quantification, and outcome prediction. We illustrate the utility of VCBART with two case studies: one examining how the association between later-life cognition and measures of socioeconomic position vary with respect to age and socio-demographics and another estimating how temporal trends in urban crime vary at the neighborhood level. An R package implementing VCBART is available at https://github.com/skdeshpande91/VCBART

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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