Journal
STATISTICS & PROBABILITY LETTERS
Volume 83, Issue 6, Pages 1553-1558Publisher
ELSEVIER
DOI: 10.1016/j.spl.2013.02.021
Keywords
Correlated data; Efficiency; Generalized estimating equations; Marginal model; Working correlation structure
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Notable bias can exist in the empirical covariance matrix of parameter estimates obtained from the quadratic inference function method that incorporates an unstructured working correlation. We therefore derive a bias correction. Via simulation, we show that the proposed correction leads to appropriate standard error estimation. (C) 2013 Elsevier B.V. All rights reserved.
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