st: Standardizing a variable and adjusting for subgroups

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

Hi,

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?

Best regards,

Christer

************************************************
Professor Christer Thrane
Department of Social Science
Lillehammer University College
2626 Lillehammer, Norway
+ 47 61 28 81 70 (fax)
+ 47 61 28 82 47 (phone, work)
+ 47 61 25 53 04 (phone, home)
E-mail, work: christer.thrane@hil.no
E-mail, home: ch-thran@online.no
************************************************


*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/