Journal
COMMUNICATIONS IN STATISTICS-THEORY AND METHODS
Volume 40, Issue 21, Pages 3839-3856Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/03610926.2010.501938
Keywords
Criterion; Generalized estimating equation; Longitudinal data; Relative efficiency; Working correlation structure
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The generalized estimating equation is a popular method for analyzing correlated response data. It is important to determine a proper working correlation matrix at the time of applying the generalized estimating equation since an improper selection sometimes results in inefficient parameter estimates. We propose a criterion for the selection of an appropriate working correlation structure. The proposed criterion is based on a statistic to test the hypothesis that the covariance matrix equals a given matrix, and also measures the discrepancy between the covariance matrix estimator and the specified working covariance matrix. We evaluated the performance of the proposed criterion through simulation studies assuming that for each subject, the number of observations remains the same. The results revealed that when the proposed criterion was adopted, the proportion of selecting a true correlation structure was generally higher than that when other competing approaches were adopted. The proposed criterion was applied to longitudinal wheeze data, and it was suggested that the resultant correlation structure was the most accurate.
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