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arXiv 1105.2072stat.ME
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具有非正态随机效应分布的Poisson混合模型

A Poisson Mixed Model with Nonnormal Random Effect Distribution

Lizandra C. Fabio, Gilberto A. Paula, Mario de Castro

摘要:

本文提出了一个随机截距泊松模型,其中的随机效应分布服从广义对数伽玛(GLG)分布。我们推导出边缘分布的前两个矩以及组内相关性。即使数值积分方法是在一般情况下所需的边际模型推导,我们得到的多变量负二项模型的一个特定的参数设置的层次模型。本文给出了一个迭代过程,用以获得多元负二项模型参数的最大似然估计。提出了残差分析方法,并给出了两个实例.

英文摘要:

We propose in this paper a random intercept Poisson model in which the random effect distribution is assumed to follow a generalized log-gamma (GLG) distribution. We derive the first two moments for the marginal distribution as well as the intraclass correlation. Even though numerical integration methods are in general required for deriving the marginal models, we obtain the multivariate negative binomial model for a particular parameter setting of the hierarchical model. An iterative process is derived for obtaining the maximum likelihood estimates for the parameters in the multivariate negative binomial model. Residual analysis are proposed and two applications with real data are given for illustration.

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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