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The S4 sequential design class
sequential.design(...)
an object of the class "sequential.design"
Additional arguments passed to the methods.
David A. Schoendfeld, PhD and Hui Zheng, PhD
The sequential design class stores the information of a sequential design, including revision history.
Proschan, MA; Lan, KKG; Wittes JT,"Statistical Monitoring of Clinical Trials: A Unified Approach", Chapter 6, Springer 2006.
Schoenfeld DA, "A Simple Algorithm for Designing Group Sequential Clinical Trials", Biometrics. 2001 Sep;57(3):972-4.
design1<-sequential.design()
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