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st: RE: Standardizing a variable and adjusting for subgroups


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Standardizing a variable and adjusting for subgroups
Date   Tue, 17 Jan 2006 19:01:17 -0000

I don't think there is any need for file ballet. 

Sounds like 

egen mean = mean(zgrade), by(school) 
egen sd = sd(zgrade), by(school)
gen zgrade2 = (zgrade - mean) / sd 

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

Christer Thrane
 
> I have a standardized variable, zgrade, wich denotes the 
> grade point average 
> for a sample of college graduates. Just recently I found out 
> that this 
> variable's overall mean value (i.e. zero) varies between the 
> five diiferent 
> schools that the graduates attended. Is it possible to make a new 
> standardized variable that also "adjusts" for these school 
> differences 
> without diasaggregating the file into five sub-files (i.e. 
> five schools) and 
> appending them afterwards?

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