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Re: st: interpretation of FE model with interaction of 2 dummies with continuous variable


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: interpretation of FE model with interaction of 2 dummies with continuous variable
Date   Thu, 16 Jul 2009 07:28:20 +0000 (GMT)

--- On Thu, 16/7/09, P K wrote:
> I am estimating a fixed-effects panel model with an
> interaciton between the following variables:
> 
> strategic_change => coded as a dummy (1 if change
> happens in year t, 0 otherwise)
> ceo_change => coded as a dummy (1 if change happens in
> year t-1, 0 otherwise)
> duration_change => continuous variable (duration clock,
> measured in year t-1)
> 
<snip>
> 
> My question is how to interpret
> the interaction terms, especially the last term where I
> interact two dummy variables (strategic change and CEO
> change) with a continuous change (duration change). 

main effect
duration change  : 
        effect of duration when no strategic and no ceo 
        change

interaction effects
strategic_change*duration_change : 
        change in effect of duration relative to main 
        effect when only strategic change

ceo_change*duration_change : 
        change in effect of duration relative to main 
        effect when only ceo change  

strategic_change*ceo_change*duration_change: 
        change in effect of duration relative to main 
        effect when both ceo and strategic change.

Hope this helps,
Maarten

-----------------------------------------
Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
Germany

http://home.fsw.vu.nl/m.buis/
-----------------------------------------





      

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