--- 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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