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st: interaction between variables


From   valentina p <valendena@hotmail.it>
To   statalist statalist <statalist@hsphsun2.harvard.edu>
Subject   st: interaction between variables
Date   Wed, 5 Dec 2007 11:50:09 +0100

Good morning,

I am using a fixed effect model.

How can I express the interaction between the regressors? 

I mean: bewteen my regressors there are immiration and natural growth. Natural growth (from descriptive analysis I made) has the same trend as immigration(t-1), so I suppose that immigration strongly influences natural growth. How can I express this relation? 

And apart from this, any suggestion on how to analyse the residuals in a fixed effect model like xtreg y x1 x2..., fe?

Thanks a lot

Val
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