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st: RE: mfx after zinb

From   Rodolphe Desbordes <>
To   "''" <>
Subject   st: RE: mfx after zinb
Date   Thu, 22 Apr 2010 12:50:17 +0100

Dear Benjamin,

Given that the variable appears in both parts of the model, -mfx- reports the overall impact of this variable on the expected value, which may be significant despite the fact that both coefficients are not significant individually. In addition, statistical significance of marginal effects and (semi-)elasticities may differ.


-----Original Message-----
From: [] On Behalf Of Benjamin Engelstätter
Sent: jeudi 22 avril 2010 12:35
Subject: st: mfx after zinb

Dear Statalisters,

I am estimating an Zinb-model and getpositive significant marginal effects after using mfx despite bothcoefficients for the appropriate covariate in the inflate and the mainequation are non significant. Does anybody know how this can happen?

all best
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