SurrogateSeq

Provides functions to implement group sequential procedures that allow for early stopping to declare efficacy using a surrogate marker and the possibility of futility stopping. More details are available in: Parast, L. and Bartroff, J (2024) doi:10.1093/biomtc/ujae108. A tutorial for this package can be found at https://laylaparast.com/home/SurrogateSeq.html.

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