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Using Generalized Estimating Equations for Longitudinal Data Analysis
Gary A. Ballinger
Purdue University
The generalized estimating equation (GEE) approach of Zeger and Liang facilitates analysis of data collected in longitudinal, nested, or repeated measures designs. GEEs use the generalized linear model to estimate more efficient and unbiased regression parameters relative to ordinary least squares regression in part because they permit specification of a working correlation matrix that accounts for the form of within-subject correlation of responses on dependent variables of many different distributions, including normal, binomial, and Poisson. The author briefly explains the theory behind GEEs and their beneficial statistical properties and limitations and compares GEEs to suboptimal approaches for analyzing longitudinal data through use of two examples. The first demonstration applies GEEs to the analysis of data from a longitudinal lab study with a counted response variable; the second demonstration applies GEEs to analysis of data with a normally distributed response variable from subjects nested within branch offices ofan organization.
Key Words: longitudinal regression • nested data analysis • generalized linear models • logistic regression • Poisson regression
Organizational Research Methods, Vol. 7, No. 2,
127-150 (2004)
DOI: 10.1177/1094428104263672
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