Statistics and Its Interface

Volume 11 (2018)

Number 2

Bayesian inference on multivariate-$t$ nonlinear mixed-effects models for multiple longitudinal data with missing values

Pages: 251 – 264

DOI: http://dx.doi.org/10.4310/SII.2018.v11.n2.a4

Authors

Wan-Lun Wang (Department of Statistics, Graduate Institute of Statistics and Actuarial Science, Feng Chia University, Taichung, Taiwan)

Luis M. Castro (Department of Statistics, Pontificia Universidad Cat´olica de Chile, Santiago, Chile)

Abstract

The multivariate-$t$ nonlinear mixed-effects model (MtNLMM) has been shown to be a promising robust tool for analyzing multiple longitudinal trajectories following arbitrary growth patterns in the presence of outliers and possible missing responses. Owing to intractable likelihood function of the model, we devise a fully Bayesian estimating procedure to account for the uncertainties of model parameters, random effects, and missing responses via the Markov chain Monte Carlo method. Posterior predictive inferences for the future values and missing responses are also investigated. We conduct a simulation study to demonstrate the feasibility of our Bayesian sampling schemes. The proposed techniques are illustrated through applications to two case studies.

Keywords

missing responses, multivariate longitudinal data, nonlinear mean profiles, posterior distributions, Taylor series expansion

Full Text (PDF format)

Received 6 August 2016

Published 7 March 2018