the determinant calculated in the inflation factor. It is possible that the performance of the Rogers estimator may be inferior in comparison to the Pan estimator under different correlation settings. The performance of the Mancl and DeRouen sandwich estimator deteriorated to coverage probabilities only slightly better than that of the Liang-Zeger in prevalence values of 1% and 5% in sample sizes of 20 and 30 subjects. The Morel sandwich estimators, at the 1% outcome prevalence level, performed better than that of Mancl and DeRouen but not as well as the Pan or Rogers’ estimators. Overall, it is wise to select any of these other estimators, if available, over the Liang-Zeger in a situation involving low sample size or low outcome prevalence.
