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Re: st: interaction without linear terms


From   Richard J Stoll <stoll@rice.edu>
To   Stata listserv <statalist@hsphsun2.harvard.edu>
Subject   Re: st: interaction without linear terms
Date   Tue, 22 May 2007 23:58:25 -0500 (CDT)

On Wed, 23 May 2007, Wanli Zhao wrote:

> I have a basic(?) econometric question on regressions with interactions. My
> search on this did not product much. Do I have to include the linear terms
> in the regression when I also have interactions (include x & y when I have
> x*y)?  What does it mean when I drop x, or y or BOTH (always keep x*y)? Any
> help is highly appreciated (occasions where different model is suitable),
> especially what I should get to read!
>

Yes.

The "classic" article in political science is:
Friedrich, Robert. 1982. "In Defense of Multiplicative Terms in Multiple
Regression Equations." American Journal of Political Science 26: 797-833.


------------------------------------------------------------------------
Richard J. Stoll * Professor of Political Science * Rice University
Dept. Political Science MS 24 * P.O. Box 1892 * Houston TX 77251-1892
E-mail: stoll@rice.edu * Tel: 713-348-3362 * FAX: 713-348-5273

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