Bayesian analysis of covariance matrices and dynamic models for longitudinal data

• 成果类型: Article
• 署名作者: Daniels, MJ; Pourahmadi, M
• 署名单位: Iowa State University; Northern Illinois University
• 刊物名称: BIOMETRIKA
• ISSN/ISSBN: 0006-3444
• DOI: 10.1093/biomet/89.3.553
• 发表日期: 2002
• 页码: 553566
• 关键词: cholesky decomposition; maximum-likelihood; inference; inverse

摘要

Parsimonious modelling of the within-subject covariance structure while heeding its positive-definiteness is of great importance in the analysis of longitudinal data. Using the Cholesky decomposition and the ensuing unconstrained and statistically meaningful reparameterisation, we provide a convenient and intuitive framework for developing conditionally conjugate prior distributions for covariance matrices and show their connections with generalised inverse Wishart priors. Our priors offer many advantages with regard to elicitation, positive definiteness, computations using Gibbs sampling, shrinking covariances toward a particular structure with considerable flexibility, and modelling covariances using covariates. Bayesian estimation methods are developed and the results are compared using two simulation studies. These simulations suggest simpler and more suitable priors for the covariance structure of longitudinal data.