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IML functions in group sequential design

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IML functions in group sequential design

I am working on 'Interim Data monitoring' in clinical trials,and found that IML is a powerful tool to compute the stopping boundaries with the function SEQ and SEQSCALE,but I can not understand the elements of these function.
I used to refer to the 'SAS/IML user's guide',but there are no examples,and I can not catch the meaning.
So,I want to know if there are some material related to the functions,ideally containing some examples.
Thank you very much! :-)
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Re: IML functions in group sequential design

I think you'll find section 4.2.8 of the book "Analysis of Clinical Trials Using SAS: A Practical Guide" (Dmitrienko,A., et. al., Cary,NCSmiley FrustratedAS Institute, 2005) helpful.
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Re: IML functions in group sequential design

Thank you so much,your reply is very helpful~
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