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2003 Oct 27
0
Whitehead's group sequential procedures
Dear List, I would like to know if there exist some R implementation of John Whitehead's procedures for the planning and analysis of group sequential clinical trials. His book is enlightenig but somewhat frustrating : it has a good basic exposition of his framework, but the technical details are sparse, and leave much work to do when one plans to reuimplement part of the procedures. For example, one has to work out the computation of test regions in non-trivial cases, the P-value a...