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The shared frailty model and the power for heterogeneity tests in multicenter trials
Duchateau, Luc, (2002)
Goodness-of-Fit Tests for the Frailty Distribution in Proportional Hazards Models with Shared Frailty
Geerdens, Candida, (2012)
Goodness-of-fit tests for the frailty distribution in proportional hazards models with shared frailty