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RE: st: Difference of means and t-test


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: Difference of means and t-test
Date   Wed, 3 Jul 2002 08:48:57 +0100

Fred Wolfe wrote

>  I am trying to compare the differences in means on a list of variables
>  between participant and comparison group. After obtaining the 
>  difference
>  for each variable, I want to run a t-test and test for significance.


You should look up the -foreach command

foreach var of varlist a b c d etc{
	ttest `var', by(group)
} 

and Si Li aked 

> Does this -foreach test need to assume independence between groups?

-foreach- is just a way of getting Stata to loop through  
the calculations. It is not statistical. 

For more information, please see the on-line help 
or the manual. 

Nick 
n.j.cox@durham.ac.uk 


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