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RE: st: FW: Marginal effects for the two-part model

From   "Michael Palmer" <>
To   <>
Subject   RE: st: FW: Marginal effects for the two-part model
Date   Fri, 4 Feb 2011 12:51:43 +1100

Understood, thanks Maarten!!  

Michael Palmer
PhD Candidate 
National Centre for Epidemiology and Population Health 
The Australian National University 
Ph. 6125 0538
M. 0437 867 940

-----Original Message-----
[] On Behalf Of Maarten buis
Sent: Thursday, 3 February 2011 7:54 PM
Subject: RE: st: FW: Marginal effects for the two-part model

--- On Thu, 3/2/11, Michael Palmer wrote:
> There seems to be some confusion on the computation of marginal 
> effects for the TPM I described as some authors still suggest combined

> marginal effects.

That depends on what the outcome of interest is. If you want the
unconditional outcome, for example people get 0 cost when they don't
seek medical help and some positive cost when they do, then you need to
include both parts of your model. However, as I understood your original
question, you wanted the cost conditional on seeking medical help.

Hope this helps,

Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen


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