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Re: st: AW: beta coefficients for interaction terms


From   lschoele@rumms.uni-mannheim.de
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: AW: beta coefficients for interaction terms
Date   Thu, 16 Apr 2009 14:06:32 +0200

How do I tell stata, that it is an inetraction term?
Here is what I did:
gen appearance_attention=apperance*attention

Is that telling stata, that the new variable is an interaction term?

I am referring to the book "Datenanalyse mit Stata" by Kohler, Kreuter

"Note that you can effect the standardization yourself via - egen, std()-" What standardization do you mean? The z-standardization or the "normal" standardization for the beta coefficients, that I need for the interpretation?

Best Lisa


Zitat von Martin Weiss <martin.weiss1@gmx.de>:

<>

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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