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st: AW: beta coefficients for interaction terms


From   "Martin Weiss" <martin.weiss1@gmx.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: AW: beta coefficients for interaction terms
Date   Thu, 16 Apr 2009 13:51:12 +0200

<> 

Also note http://www.stata.com/statalist/archive/2007-03/msg00028.html




HTH
Martin


-----Ursprüngliche Nachricht-----
Von: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von
lschoele@rumms.uni-mannheim.de
Gesendet: Donnerstag, 16. April 2009 12:35
An: statalist@hsphsun2.harvard.edu
Betreff: st: beta coefficients for interaction terms

Hi Statalist,

I am working on a regression model with interactions between some  
variables. I read in a book, that I can't use the "normal"  
standardized beta coefficients for the interaction terms. They said  
that the interpretation of the beta coefficients is not possible until  
you z-standardise the interaction variables before you do the  
regression.

Does anyone know, if stata does the z-standardization for the  
interaction variables automatically, so I can use the normal  
standardized beta coefficients (shown in the stata output) for the  
interpretation?
I am using the 9.1 version of stata.

I hope someone can help me.

Best Lisa

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