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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 13:17:25 +0200

<> 

Well, did you tell Stata in any way that a specific variable is an
"interaction term"? If not, Stata probably treats it as just another
covariate in your regression.

BTW, which book are you referring to?

Note that you can effect the standardization yourself via - egen, std()-


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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