RE: st: Heckprob and marginal effects question-Economics audience

["jyotsna puri" <pjyotsna@hotmail.com>]

Dear Lisa,
Read Woolridge (2002). He has special sections on 'Results to report' which 
will
suit a Economist audience. I believe the typical 'Heckman' type model is 
covered
in the chapter on 'Selection and Attrition' and he calls the model something 
else.
(Don't have the book with me.)
HTH
-Jyotsna



Jyotsna (Jo) Puri
Cell and Voicemail: 201-805-1690
pjyotsna@hotmail.com
Doctoral Candidate, Department of Agriculture and Resource Economics,
University of Maryland, College Park, MD
I ran the Marine Corp Marathon to help educate.




----Original Message Follows----
From: Lisa Gary <lcgary@yahoo.com>
Reply-To: statalist@hsphsun2.harvard.edu
To: statalist@hsphsun2.harvard.edu
Subject: st: Heckprob and marginal effects question-Economics audience
Date: Tue, 8 Feb 2005 10:12:03 -0800 (PST)

I am not that familiar with heckman type models and I
want to know which is the preferred marginal effect to
present in articles especially in economics/ health
economics. With heckprob, you can get marginal effects
with mfx for unconditional/ univariate probabilities
(pmargin) or mfx for conditional probabilities
(pcond). In my case my outcome equation should only
take place in the presence of the selection variable
occurring, does this mean I should use mfx for pcond?
Or should I use the mfx for pmargin since it takes
into consideration the selection effects
automatically?? I have read Greene and STATA reference
all to no avail.
Any help would be appreciated.
Lisa
Public Health
Yale



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