Parametric modeling of longitudinal data: Introduction and overview

Authored by: Garrett Fitzmaurice , Geert Verbeke

Longitudinal Data Analysis

Print publication date:  August  2008
Online publication date:  August  2008

Print ISBN: 9781584886587
eBook ISBN: 9781420011579
Adobe ISBN:

10.1201/9781420011579.ch2

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Abstract

Chapter 1 traced the development of regression models for longitudinal observations, from the simple univariate repeated-measures ANOVA model through the versatile class of linear mixed-effect models for continuous responses. Generalizations of linear models for discrete longitudinal data have followed a number of different research directions. Two important extensions are marginal (or population-averaged) models and generalized linear mixed models (GLMMs). Marginal models and the generalized estimating equations approach to inference are the subject of Chapter 3. Generalized linear mixed models are discussed in detail in Chapter 4. Both of these broad classes of models can be considered extensions of generalized linear models for longitudinal data, albeit with somewhat different targets of inference. Chapter 7 highlights various aspects of interpretation of regression parameters in these two classes of models, emphasizing their different targets of inference and the distinct scientific questions that can be addressed by each class of models. Although these two classes of models have distinct targets of inference, they have proven to be very useful for analyzing longitudinal data across a wide spectrum of disciplines. In Section 2.2 we review marginal and generalized linear mixed models, emphasizing the main differences in approach.

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