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


From   "Christer Thrane" <ch-thran@online.no>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Re: RE: Standardizing a variable and adjusting for subgroups
Date   Tue, 17 Jan 2006 21:40:29 +0100

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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