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Group-sequential designs for time-to-event-endpoints are a subclass of both TwoStageDesignSurvival and GroupSequentialDesign.
TwoStageDesignSurvival
GroupSequentialDesign
TwoStageDesignSurvival-class and GroupSequentialDesign-class for superclasses and inherited methods.
TwoStageDesignSurvival-class
GroupSequentialDesign-class