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arXiv 2203.10028stat.MEmath.STstat.TH
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直接从一类空间潜在高斯过程模型的后验分布中生成独立重复样本

Generating Independent Replicates Directly from the Posterior Distribution for a Class of Spatial Latent Gaussian Process Models

Jonathan R. Bradley, Madelyn Clinch

AI总结:

针对MCMC计算负担问题,提出广义共轭多元分布,通过精确后验回归方法直接从空间潜在高斯过程模型后验分布中高效生成独立重复样本。

摘要:

马尔可夫链蒙特卡洛(MCMC)允许人们从后验分布中生成具有依赖性的重复样本,适用于几乎任何贝叶斯分层模型。然而,MCMC会产生显著的计算负担。这促使我们考虑寻找后验分布的表达式,使其在计算上能够直接且简便地获取独立重复样本。我们聚焦于一类广泛的允许空间相关数据的贝叶斯潜在高斯过程(LGP)模型。首先,我们推导出一类新分布,称为广义共轭多元(GCM)分布。GCM分布的理论推导与CM分布类似,但有两个主要区别:即(1)GCM允许潜在高斯过程假设,以及(2)GCM通过边际化显式地考虑超参数。推导GCM是为了直接从具有高效投影/回归形式的精确后验分布中获取独立重复样本。因此,我们将该方法称为精确后验回归(EPR)。文中提供了说明性示例,包括针对弱平稳空间过程和空间基函数展开的模拟研究。此外,还使用条件自回归模型,对美国人口普查局美国社区调查(ACS)的贫困发生率数据进行了补充分析。

英文摘要:

Markov chain Monte Carlo (MCMC) allows one to generate dependent replicates from a posterior distribution for effectively any Bayesian hierarchical model. However, MCMC can produce a significant computational burden. This motivates us to consider finding expressions of the posterior distribution that are computationally straightforward to obtain independent replicates from directly. We focus on a broad class of Bayesian latent Gaussian process (LGP) models that allow for spatially dependent data. First, we derive a new class of distributions we refer to as the generalized conjugate multivariate (GCM) distribution. The GCM distribution's theoretical development is similar to that of the CM distribution with two main differences; namely, (1) the GCM allows for latent Gaussian process assumptions, and (2) the GCM explicitly accounts for hyperparameters through marginalization. The development of GCM is needed to obtain independent replicates directly from the exact posterior distribution, which has an efficient projection/regression form. Hence, we refer to our method as Exact Posterior Regression (EPR). Illustrative examples are provided including simulation studies for weakly stationary spatial processes and spatial basis function expansions. An additional analysis of poverty incidence data from the U.S. Census Bureau's American Community Survey (ACS) using a conditional autoregressive model is presented.

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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