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The GENMOD Procedure - SAS
Generalized estimating equations (GEEs) provide a practical method with reasonable statistical efficiency to analyze such data. Liang and Zeger(1986) introduced GEEs as a method of dealing with correlated data when, except for the correlation among responses, the data can be modeled as a generalized linear model. For example, correlated
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Fitting generalized estimating equation (GEE) regression ...
www.stata.comGeneralized estimating equations Ł Described by Liang and Zeger (Biometrika, 1986) and Zeger and Liang (Biometrics, 1986) to extend the generalized linear model to allow for correlated observations Ł Characterize the marginal expectation (average response for observations sharing the same covariates) as a function of covariates