title: Estimating the number of clusters for the analysis of correlated binary response variables from unbalanced data.
abstract: Dominating the literature on sample size determination are papers concerned with observations collected from independent responses. We discuss in this paper, under the common correlation model for binary responses, the issue of estimating the number of groups when the sampling units are clusters of variable sizes.
authors.affiliation: Department of Population Medicine, University of Guelph, Ontario, Canada.
authors.forename: M M
authors.initials: MM
authors.lastname: Shoukri
authors.forename: S W
authors.initials: SW
authors.lastname: Martin
mesh_terms: D015982:Bias; D016000:Cluster Analysis; D006801:Humans; D015233:Models, Statistical; D016032:Randomized Controlled Trials as Topic / Q000592:standards*; D012494:Sampling Studies