st: Fwd: STATA/ detectable difference

[Steven Samuels <sjhsamuels@earthlink.net>]

Elliot emailed me privately with the information that a Journal  
Reviewer asked for the "minimum detectable" difference. In this case,  
Elliot should give a set of plausible values, not just the observed  
sample value, for one of his proportions.  So, if he observed  p0_hat  
= 12% and p1_hat = 20%, he might use values p0 = 0.10 0.125 0.15 to  
compute minimum detectable risks.

Then he can state.  "The minimum relative risks detectable in advance  
depended on the true proportion in Group 1. For assumed proportions  
of 0.10, 0.125, and 0.15, the corresponding detectable relative risks  
were:  x, y, and z."

-Steve

Begin forwarded message:


> From: Elliott Dasenbrook <edasenb1@jhmi.edu>
> I have submitted a manuscript and a reviewer requested that we  
> provide "the minimum detectable difference that our study had the  
> power to detect";

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