Statalist


[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]

st: R: Control groups


From   "Carlo Lazzaro" <carlo.lazzaro@tin.it>
To   <statalist@hsphsun2.harvard.edu>
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
10).  

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

Carlo
-----Messaggio originale-----
Da: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] Per conto di
Alexander.Severinsen@telenor.com
Inviato: venerd́ 9 maggio 2008 23.52
A: statalist@hsphsun2.harvard.edu
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

*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/



*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/



© Copyright 1996–2014 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   What's new   |   Site index