Journal
BIOMETRIKA
Volume 89, Issue 3, Pages 567-578Publisher
BIOMETRIKA TRUST
DOI: 10.1093/biomet/89.3.567
Keywords
between-cluster and within-cluster effects; generalised estimating equations; optimal estimating equation theory
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Examples of clustered data include data from longitudinal studies and data sampled within groups. This paper proposes a regression analysis method for clustered data that optimally weights and combines contrasts of the data through a combination of estimating equations. Examples of combining between-cluster, within-cluster and longitudinal data contrasts are presented. The method results in increased estimation efficiency relative to generalised estimating equations with standard working correlation structures. The proposed method also simplifies modelling decisions regarding the true correlation structure of the data and avoids correlation parameter estimation.
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