> Does anybody know how to calculate the sample size needed to prove
> EQUIVALENCE, not difference of two treatments concerning survival data
> (log-rank test, cox regression).
>
> Thanks Bernd
>
If you were willing to use proportions or means, you could use our program
PASS (at www.ncss.com) to solve your problem. You can try it out for free
for 30 days.
You might want to use two one-sided confidence limits. This is the approach
of Farrington and Manning which seems to be popular. This can of thing shows
up in Statistics in Medicine.
Regards,
Jerry Hintze, NCSS
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