GroupSeq: A GUI-Based Program to Compute Probabilities Regarding Group Sequential Designs

A graphical user interface to compute group sequential designs based on normally distributed test statistics, particularly critical boundaries, power, drift, and confidence intervals of such designs. All computations are based on the alpha spending approach by Lan-DeMets with various alpha spending functions being available to choose among.

Version: 1.3.3
Imports: tcltk
Published: 2015-07-08
Author: Roman Pahl
Maintainer: Roman Pahl <roman.pahl at>
License: GPL-2 | GPL-3 [expanded from: GPL (≥ 2)]
NeedsCompilation: no
Materials: NEWS
In views: ClinicalTrials
CRAN checks: GroupSeq results


Reference manual: GroupSeq.pdf
Package source: GroupSeq_1.3.3.tar.gz
Windows binaries: r-devel:, r-release:, r-oldrel:
OS X Snow Leopard binaries: r-release: GroupSeq_1.3.3.tgz, r-oldrel: GroupSeq_1.3.2.tgz
OS X Mavericks binaries: r-release: GroupSeq_1.3.2.tgz
Old sources: GroupSeq archive