Hello - 

I am wondering if anyone has written some R code to calculate futility 
bounds for a group sequential analysis of clinical trials data.  The 
library ldbounds has a function 'bounds'  which calculates the 
effectiveness stopping bounds for various spending functions,  but it does 
not appear to do the same for futility (sometimes called the 'inner 
wedge').

Thanks for any assistance!

-Alice

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