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RE: st: FW: Marginal effects for the two-part model
From
"Michael Palmer" <[email protected]>
To
<[email protected]>
Subject
RE: st: FW: Marginal effects for the two-part model
Date
Wed, 2 Feb 2011 16:25:09 +1100
Thanks Maarten,
I also thought this was the case (independent me) until I read a few
papers that argue otherwise.
See for example, http://repec.rwi-essen.de/files/REP_09_138.pdf.
Cheers,
Michael
Michael Palmer
PhD Candidate
National Centre for Epidemiology and Population Health
The Australian National University
Ph. 6125 0538
M. 0437 867 940
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Maarten buis
Sent: Tuesday, 1 February 2011 6:59 PM
To: [email protected]
Subject: RE: st: FW: Marginal effects for the two-part model
--- On Tue, 1/2/11, Michael Palmer wrote:
> The first part of the model is logit model for seeking hospital care
> followed by an ols model for the cost of care for persons that sought
> care.
>
> Simplified code is:
>
> Logit care $xvar, robust
>
> Reg cost $xvar if care==1
>
> I am wanting to compute the conditional marginal effects but do not
> know how to do this.
In this model the cost is independent of seeking care, so the marginal
effects of $xvar on the cost conditional on seeking care are just your
regression coefficients (the output you got from -regress-).
Typically, when estimating both parts you would want to allow for
correlation in the error terms across your two steps. I tend to think of
those correlations as variables that influence both the probability of
seeking care and the cost and are not in $xvar. If that is what you
want, then you can take a look at -help heckman-.
Hope this helps,
Maarten
--------------------------
Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
Germany
http://www.maartenbuis.nl
--------------------------
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