Performing computations related to group sequential designs CRAN Task View: ClinicalTrials (http://CRAN.R-project.org/view=ClinicalTrials) The computations are done via the alpha spending approach i.e. interim analyses need not to be equally spaced, and their number need not to be specified in advance. Software Suggests: tcltk Roman Pahl <projects.pahl@web.de> Roman Pahl GPL (>= 2) 2009-02-24 application/tgz http://CRAN.R-project.org/package=GroupSeq