GroupSeq: A GUI-based program to compute probabilities regarding group sequential designs

The package provides a Tcl/Tk-based graphical user interface. It enables the construction of group sequential designs based on normally distributed test statistics, and particularly to compute critical boundaries, power, drift, and confidence intervals for such designs. All computations are done via the alpha spending approach by Lan-DeMets. Various alpha spending functions are made available to the user for this purpose.

Version: 1.3.2
Suggests: tcltk
Published: 2014-01-10
Author: Roman Pahl
Maintainer: Roman Pahl <rpahl 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_1.3.2.tar.gz
Windows binaries: r-devel:, r-release:, r-oldrel:
OS X Snow Leopard binaries: r-release: GroupSeq_1.3.2.tgz, r-oldrel: GroupSeq_1.3.2.tgz
OS X Mavericks binaries: r-release: GroupSeq_1.3.2.tgz
Old sources: GroupSeq archive