st: Re: RE: Standardizing a variable and adjusting for subgroups

["Christer Thrane" <ch-thran@online.no>]

Thanks, Nick!

Christer
----- Original Message ----- 
From: "Nick Cox" <n.j.cox@durham.ac.uk>
To: <statalist@hsphsun2.harvard.edu>
Sent: Tuesday, January 17, 2006 8:01 PM
Subject: st: RE: Standardizing a variable and adjusting for subgroups



> 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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