Hello Everyone, I need to perform a sample size calculation using a drop the loser/keep the winner design. I've been searching for examples of how to do this using R but haven't found much. The most promising possibility thus far is an R function called DrpLsrNRst. This appears in the book "Adaptive Design Theory and Implementation Using SAS and R". I found the function online but there's a copyright statement saying it can only be used by those who have purchased the book. I thought about purchasing the book, but a reviewer on Amazon indicated it's mostly a SAS book with a little R code thrown in and an examination of the TOC suggests this is the case. I'm still primarily a SAS user, but am in the process of changing that. So I'm shying away from purchasing what I perceive to be a SAS book unless it's really necessary. Does anyone know of any other resources? Thanks, Paul
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