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Re: st: How to model a positive continuous dependent variable with many zeros?


From   Adriaan Hoogendoorn <aw.hoogendoorn@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: How to model a positive continuous dependent variable with many zeros?
Date   Thu, 9 Jun 2011 15:24:52 +0200

Dear Steve, Hitesh and Maarten,

Steves idea of modelling proportions put us on the right track,
because we figured out that these proportions are the important
outcome variable here.
The reference to Kit Baum's Stata Tip was very useful, since it
explains how proportions with zeroes (and ones) can be modelled by a
GLM with a logit link function and a binomial distribution as family
choice.
It turned out to be possible to extend the GLM by use of GLLAMM to
incorporate the multilevel structure.

Thank you for suggesting the use of two-part models for dealing with
the many zeroes, which may become usefull in future problems.

Kind regards, Adriaan Hoogendoorn
GGZ inGeest, Amsterdam
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