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Re: st: two-part models


From   Todd Wagner <twagner@stanford.edu>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: two-part models
Date   Wed, 09 Oct 2002 11:39:08 -0700

Daniel,

My experience with two-part models involves health services research. In this realm, a typical two part model is not 2SLS. Rather, the first part involves estimating who uses health services (0=no use, 1=any use), generally with a logit or probit model. The second part involves an independent regression, such as a negative binomial, looking at number of visits among users.

If you are starting to head down this track, these usefulness of these models has been debated. A good starting point is

Mullahy, J. (1998). Much ado about two: reconsidering retransformation and the two-part model in health econometrics. J Health Econ, 17(3), 247-281.

Todd

At 01:02 PM 10/9/2002 -0400, you wrote:

Easy question: Are two-part models the same as two-stage models as in 2SLS?







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