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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   Tue, 1 Feb 2011 17:25:26 +1100

Hi, many thanks for your reply, 

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

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. Any help would be greatly appreciated. 

With thanks, 



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: Monday, 31 January 2011 9:21 PM
Subject: Re: st: FW: Marginal effects for the two-part model

--- On Mon, 31/1/11, Michael Palmer wrote:
> Can somebody out there please pass on Stata code for estimating 
> marginal effects from a two-part model.

There are many different models that go by the name "two-part model",
which one do you mean? The easiest way of giving a concise description
is to give us the stata code you used for estimating your model.

-- Maarten

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


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