A Bayesian hierarchical model for related densities by using Pólya trees
A Bayesian hierarchical model for related densities by using Pólya trees
复制标题
使用 Pólya 树计算相关密度的贝叶斯分层模型
DOI:
10.1111/rssb.12346
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发表时间:
2020
期刊:
影响因子:
--
通讯作者:
Ma, Li
中科院分区:
文献类型:
--
作者:
Christensen, Jonathan;Ma, Li
Bayesian hierarchical models are used to share information between related samples and to obtain more accurate estimates of sample level parameters, common structure and variation between samples. When the parameter of interest is the distribution or density of a continuous variable, a hierarchical model for continuous distributions is required. Various such models have been described in the literature using extensions of the Dirichlet process and related processes, typically as a distribution on the parameters of a mixing kernel. We propose a new hierarchical model based on the Pólya tree, which enables direct modelling of densities and enjoys some computational advantages over the Dirichlet process. The Pólya tree also enables more flexible modelling of the variation between samples, providing more informed shrinkage and permitting posterior inference on the dispersion function, which quantifies the variation between sample densities. We also show how the model can be extended to cluster samples in situations where the observed samples are believed to have been drawn from several latent populations.
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影响因子:
1.9
作者:
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通讯作者:
Yuan Ji
DOI:
--
发表时间:
2014
期刊:
影响因子:
--
作者:
Jim E. Griffin;F. Leisen
通讯作者:
F. Leisen
影响因子:
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作者:
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通讯作者:
Ma, Li
影响因子:
4.4
作者:
Ma, Li
通讯作者:
Ma, Li
DOI:
10.1198/016214508000000553
发表时间:
2008-09-01
影响因子:
3.7
作者:
Rodriguez, Abel;Dunson, David B.;Gelfand, Alan E.
通讯作者:
Gelfand, Alan E.