Dear Alexander,
I would suggest you to take a look at -help sampsi- (I use Stata 9/SE, so I
am not aware of any possible different labelling of this procedure in Stata
10).
Kind Regards and Nice W-E to you and to all the Statalisters,
Carlo
-----Messaggio originale-----
Da: [email protected]
[mailto:[email protected]] Per conto di
[email protected]
Inviato: venerd� 9 maggio 2008 23.52
A: [email protected]
Oggetto: st: Control groups
Dear Statalisters,
Say I have a population of 500 000. I would like to treat this
population with some sort of communication, and to be able to measure
the effect of this treatment I have the opportunity to draw a control
group. Based on earlier experiences the effects between the treated and
the controlgroup could be as small as 0.5%.
I want to be able to detect such a small effects, and I am wondering how
large my control groups ideally would be to track these changes, say at
an alpha level of 0.05.
I have tried to use the fpower (findit fpower) and the simpower (findit
simpower) to determine optimal control group sizes. I am curious whether
there are other alternatives in Stata?
Thanks! And have a nice weekend.
Best wishes,
Alexander
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