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st: RE: Difference of means and t-test for dummy variable


From   "Maarten Buis" <M.Buis@fsw.vu.nl>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Difference of means and t-test for dummy variable
Date   Tue, 10 Jul 2007 13:51:27 +0200

--- Woong Tae Chung wrote:
> I am trying to compare the differences in means on a dummy variable
> between participant and comparison group. In the case of continuous 
> variable, it can be performed  by "ttest var, by(group)" but it
> works for dummy variable, too?

The mean of a dummy variable is a proportion. -prtest- is a better 
way of doing such a test, see: -help prtest- 

Hope this helps,
Maarten

-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology 
Vrije Universiteit Amsterdam 
Boelelaan 1081 
1081 HV Amsterdam 
The Netherlands

visiting address:
Buitenveldertselaan 3 (Metropolitan), room Z434 

+31 20 5986715

http://home.fsw.vu.nl/m.buis/
-----------------------------------------



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