Group Sequential Analysis of Clinical Trials R package grpseq version 1.0 CRAN Task View: ClinicalTrials (https://CRAN.R-project.org/view=ClinicalTrials) Design of group sequential trials, including non-binding futility analysis at multiple time points (Gallo, Mao, and Shih, 2014, <doi:10.1080/10543406.2014.932285>). Software Depends: R (>= 2.10) Imports: mvtnorm Suggests: knitr, rmarkdown Lu Mao <lmao@biostat.wisc.edu> Comprehensive R Archive Network (CRAN) Lu Mao GPL (>= 2) 2021-12-06 application/tgz https://CRAN.R-project.org/package=grpseq doi:10.32614/CRAN.package.grpseq