- Understanding group sequential designs
See this vignette if you want to understand how group sequential design probabilities are calculated and gain an intuitive understanding of the underlying methods.

- Introduction to GroupSeq
Start here if this is your first time using GroupSeq. This vignette gives a brief overview of what can be done with GroupSeq.

- -1- Compute Bounds
This vignette shows how to use GroupSeq to compute group sequential designs under the null hypothesis, introduces all available options and discusses some nuances of certain design types.

- -2- Compute Drift given Power and Bounds
This vignette shows how to use GroupSeq to compute group sequential designs with a certain power and how to interpret the results.

- -3- Compute Probabilities given Bounds and Drift
This vignette shows how to use GroupSeq to compute group sequential probabilities under both H0 or H1.

- -4- Compute Confidence Interval
This vignette shows how to use GroupSeq to compute confidence intervals at the final stage of a group sequential analysis.