permGS is an R package implementing permutational group-sequential tests for time-to-event data based on the two-sample (weighted) log-rank test statistic. It supports exact permutation test when the censoring distributions are equal in the treatment and the control group and approximate imputation-permutation methods when the censoring distributions are different. One- and two-sided testing is possible.


Get the released version from CRAN:


Or the development version from github:

# install.packages("devtools")

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permGS documentation built on May 2, 2019, 9:16 a.m.