Sampling from the posterior distribution in generalized linear mixed models

Authors:
Dani Gamerman
Affiliations:
Instituto de Matema´tica, Universidade Federal do Rio de Janeiro, Caixa Postal 68530, 21945–970 Rio de Janeiro, RJ, Brazil
Venue:
Statistics and Computing
Year:
1997

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Abstract

Generalized linear mixed models provide a unified framework for treatment of exponential family regression models, overdispersed data and longitudinal studies. These problems typically involve the presence of random effects and this paper presents a new methodology for making Bayesian inference about them. The approach is simulation-based and involves the use of Markov chain Monte Carlo techniques. The usual iterative weighted least squares algorithm is extended to include a sampling step based on the Metropolis–Hastings algorithm thus providing a unified iterative scheme. Non-normal prior distributions for the regression coefficients and for the random effects distribution are considered. Random effect structures with nesting required by longitudinal studies are also considered. Particular interests concern the significance of regression coefficients and assessment of the form of the random effects. Extensions to unknown scale parameters, unknown link functions, survival and frailty models are outlined.