Power in a Group Sequential Design R package PwrGSD version 2.3.8 CRAN Task View: ClinicalTrials (https://CRAN.R-project.org/view=ClinicalTrials) CRAN Task View: ExperimentalDesign (https://CRAN.R-project.org/view=ExperimentalDesign) Tools for the evaluation of interim analysis plans for sequentially monitored trials on a survival endpoint; tools to construct efficacy and futility boundaries, for deriving power of a sequential design at a specified alternative, template for evaluating the performance of candidate plans at a set of time varying alternatives. See Izmirlian, G. (2014) <doi:10.4310/SII.2014.v7.n1.a4>. Software Depends: survival Grant Izmirlian <izmirlig@mail.nih.gov> Comprehensive R Archive Network (CRAN) Grant Izmirlian [aut, cre] GPL (>= 2) 2024-10-10 application/tgz https://CRAN.R-project.org/package=PwrGSD doi:10.32614/CRAN.package.PwrGSD