Group Sequential Designs of Multi-Arm Multi-Stage Trials R package gsMAMS version 0.7.2 CRAN Task View: CausalInference (https://CRAN.R-project.org/view=CausalInference) CRAN Task View: ClinicalTrials (https://CRAN.R-project.org/view=ClinicalTrials) It provides functions to generate operating characteristics and to calculate Sequential Conditional Probability Ratio Tests(SCPRT) efficacy and futility boundary values along with sample/event size of Multi-Arm Multi-Stage(MAMS) trials for different outcomes. The package is based on Jianrong Wu, Yimei Li, Liang Zhu (2023) <doi:10.1002/sim.9682>, Jianrong Wu, Yimei Li (2023) "Group Sequential Multi-Arm Multi-Stage Survival Trial Design with Treatment Selection"(Manuscript accepted for publication) and Jianrong Wu, Yimei Li, Shengping Yang (2023) "Group Sequential Multi-Arm Multi-Stage Trial Design with Ordinal Endpoints"(In preparation). Software Imports: mvtnorm, stats, survival Suggests: knitr, rmarkdown, testthat (>= 3.0.0) Tushar Patni <tushar.patni006@gmail.com> Comprehensive R Archive Network (CRAN) Tushar Patni [aut, cre], Yimei Li [aut], Jianrong Wu [aut] GPL-3 2024-05-10 application/tgz https://CRAN.R-project.org/package=gsMAMS doi:10.32614/CRAN.package.gsMAMS