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Stuart R. Lipsitz, Keith B. G. Dear, Lueping Zhao, Jackknife Estimators of Variance for Parameter Estimates from Estimating Equations with Applications to Clustered Survival Data, Biometrics, Vol. 50, No. 3 (Sep., 1994), pp. 842-846
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Lipsitz et al. (1994) studied this question.
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