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st: Minimal Detectable Difference


From   Lars Folkestad <lfolkestad@health.sdu.dk>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   st: Minimal Detectable Difference
Date   Tue, 5 Jun 2012 13:38:46 +0200

Dear List

This might be a bit more of a stats question than a stata question.

I am about to do a cross sectional study comparing two groups regarding a measured continous variable.
I know the the variance of the measurement. No one has ever investigated these groups before using this or similar machines. For practical reasons i only have a limited number of participants available for this project. I am now wondering what the minimal detectable difference between the two groups are with the number of participants i have available.

I will use a t-test (paired, seeing the two groups are matched)

How do i calculate this using stata?

lars

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