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st: RE: mfx after zinb


From   Rodolphe Desbordes <rodolphe.desbordes@strath.ac.uk>
To   "'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu>
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.

Rodolphe



-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Benjamin Engelstätter
Sent: jeudi 22 avril 2010 12:35
To: statalist@hsphsun2.harvard.edu
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
Benjamin
Zentrum für Europäische Wirtschaftsforschung GmbH (ZEW), L7,1 68161 Mannheim Sitz der Gesellschaft: Mannheim Amtsgericht Mannheim HRB 6554
Aufsichtsratsvorsitzender: Gerhard Stratthaus MdL, Finanzminister a.D.
Geschaeftsfuehrer: Prof. Dr. Dr. h.c. mult. Wolfgang Franz, Thomas Kohl Centre for European Economic Research L7,1 68161 Mannheim Germany Seat of the Company: Mannheim Local Court Mannheim HRB 6554 Chairman of the Supervisory Board: Gerhard Stratthaus MdL, Minister, ret.
Executive Directors: Prof. Dr. Dr. h.c. mult. Wolfgang Franz, Thomas Kohl
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