Hierarchical likelihood methods for nonlinear and generalized linear mixed models with missing data and measurement errors in covariates

Authors:
Maengseok Noh;Lang Wu;Youngjo Lee
Affiliations:
Department of Statistics, Pukyong National University, Busan 599-1, Republic of Korea;Department of Statistics, University of British Columbia, Vancouver, Canada;Department of Statistics, Seoul National University, Seoul 151-742, Republic of Korea
Venue:
Journal of Multivariate Analysis
Year:
2012

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Abstract

Nonlinear mixed-effects (NLME) models and generalized linear mixed models (GLMM) are popular in the analyses of longitudinal data and clustered data. Covariates are often introduced to partially explain the large between individual (cluster) variation. Many of these covariates, however, contain missing data and/or are measured with errors. In these cases, likelihood inference can be computationally very challenging since the observed data likelihood involves a high-dimensional and intractable integral. Computationally intensive methods such as Monte-Carlo EM algorithms may offer computational difficulties such as very slow convergence or even non-convergence. In this article, we consider hierarchical likelihood methods which approximate the observed-data likelihood using Laplace approximation so completely avoid the intractable integral. We evaluate the methods via simulation and illustrate the methods by two examples.