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st: R: Control groups

From   "Carlo Lazzaro" <>
To   <>
Subject   st: R: Control groups
Date   Sat, 10 May 2008 08:50:42 +0200

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

Kind Regards and Nice W-E to you and to all the Statalisters,

-----Messaggio originale-----
[] Per conto di
Inviato: venerd́ 9 maggio 2008 23.52
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,

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