Semiparametric mixed‐scale models using shared Bayesian forests
Semiparametric mixed‐scale models using shared Bayesian forests
复制标题
使用共享贝叶斯森林的半参数混合尺度模型
DOI:
10.1111/biom.13107
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发表时间:
2019
期刊:
影响因子:
1.9
通讯作者:
Lipsitz, Stuart R.
中科院分区:
文献类型:
--
作者:
Linero, Antonio R.;Sinha, Debajyoti;Lipsitz, Stuart R.
This paper demonstrates the advantages of sharing information about unknown features of covariates across multiple model components in various nonparametric regression problems including multivariate, heteroscedastic, and semicontinuous responses. In this paper, we present a methodology which allows for information to be shared nonparametrically across various model components using Bayesian sum‐of‐tree models. Our simulation results demonstrate that sharing of information across related model components is often very beneficial, particularly in sparse high‐dimensional problems in which variable selection must be conducted. We illustrate our methodology by analyzing medical expenditure data from the Medical Expenditure Panel Survey (MEPS). To facilitate the Bayesian nonparametric regression analysis, we develop two novel models for analyzing the MEPS data using Bayesian additive regression trees—a heteroskedastic log‐normal hurdle model with a “shrink‐toward‐homoskedasticity” prior and a gamma hurdle model.
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期刊:
WIREs Data Mining Knowl. Discov.
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影响因子:
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作者:
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Linero, Antonio R.