Summarizing the goodness of fit of generalized linear models for longitudinal data

This paper extends four goodness-of-fit measures of a generalized linear mo del (GLM) to random effects and marginal models for longitudinal data. The four measures are the proportional reduction in entropy measure, the propor tional reduction in deviance measure, the concordance correlation coefficie nt and the concordance index. The extended measures satisfy the basic requi rements for measures of association. Two examples illustrate their use in m odel selection. Copyright (C) 2000 John Wiley & Sons, Ltd.