Thank you very much. Just to confirm, there is no need to compare
marginal effect by splitting sample. As long as I provide the
incidence-rate ratio for interaction term and it is sigificant, I can
say that the hypothesized interaction is supported. Right?
Best,
Jianhong
On Mon, Oct 24, 2011 at 11:43 AM, Maarten Buis <maartenlbuis@gmail.com> wrote:
> On Mon, Oct 24, 2011 at 5:33 PM, Jianhong Chen wrote:
>> First, I used nbreg, dv iv moderator iv*moderator, the coefficient of
>> interaction terms in results section is 0.81. Then, I used nbreg, dv
>> iv moderator iv* moderator, irr; the IRR of interaction terms in the
>> results section is 1.20. Both is significant (p=0.023).
>
> That will always be true. -irr- does not change the model, it only
> changes how the results are displayed.
>
> -- Maarten
>
> --------------------------
> Maarten L. Buis
> Institut fuer Soziologie
> Universitaet Tuebingen
> Wilhelmstrasse 36
> 72074 Tuebingen
> Germany
>
>
> http://www.maartenbuis.nl
> --------------------------
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