Lan-DeMets Method for Group Sequential Boundaries CRAN Task View: ClinicalTrials (http://CRAN.R-project.org/view=ClinicalTrials) Computations related to group sequential boundaries. Includes calculation of bounds using the Lan-DeMets alpha spending function approach. Software Depends: lattice Charlie Casper <casper@stat.wisc.edu> Charlie Casper and Oscar A. Perez. Based on FORTRAN program ld98. GPL (>= 2) 2006-05-23 application/tgz http://CRAN.R-project.org/package=ldbounds