Lan-DeMets Method for Group Sequential Boundaries R package ldbounds version 2.0.2 CRAN Task View: ClinicalTrials (https://CRAN.R-project.org/view=ClinicalTrials) Computations related to group sequential boundaries. Includes calculation of bounds using the Lan-DeMets alpha spending function approach. Based on FORTRAN program ld98 implemented by Reboussin, et al. (2000) <doi:10.1016/s0197-2456(00)00057-x>. Software Imports: graphics, stats Suggests: R.rsp Charlie Casper <charlie.casper@hsc.utah.edu> Comprehensive R Archive Network (CRAN) Charlie Casper, Thomas Cook and Oscar A. Perez. Based on FORTRAN program ld98. GPL (>= 2) 2023-12-02 application/tgz https://CRAN.R-project.org/package=ldbounds doi:10.32614/CRAN.package.ldbounds