SUDAAN is specifically designed for analysis of cluster-correlated data from studies involving recurrent events, longitudinal data, repeated measures, multivariate outcomes, multi-stage sample designs, stratified designs, unequally weighted data, and without replacement samples. SUDAAN fits marginal or population-averaged models using generalized estimating equations (GEE). Robust variance estimates are computed which fully account for intracluster correlation, unequal weighting, stratification, and without-replacement sampling.
SUDAAN is the only software package to offer all three popular robust variance estimation methods:
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For more information on SUDAAN: RTI International