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Heterogeneity between centers in multicenter trials with time to event outcome can be modeled by the frailty proportional hazards model. The majority of the different approaches that have been used to fit frailty models assume either the gamma or the lognormal frailty density and are based on sim...


Duchateau, L.Janssen, P.Lindsey, P.Legrand, C.Nguti, R.Sylvester-Bradley, Rosemary[The shared frailty model and the power for heterogeneity tests in multicenter trials]The shared frailty model and the power for heterogeneity tests in multicenter trials
Sylvester-Bradley, RosemaryFranco D, MAMosquera P, D.[Efectividad relativa de combinaciones de rizobios con leguminosas forrajeras tropicales: Catálogo de resultados de ensayos en invernadero y campo = Relative effectiveness of tropical forage legume-rhizobium combinations: Catalogue of results of greenhouse and field trials]Efectividad relativa de combinaciones de rizobios con leguminosas forrajeras tropicales: Catálogo de resultados de ensayos en invernadero y campo = Relative effectiveness of tropical forage legume-rhizobium combinations: Catalogue of results of greenhouse and field trials

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