st: 2-part random effects GLM

[Jeph Herrin <stata@spandrel.net>]

All,

I am interested in estimating a 2-part random effects GLM model. I'm new 
to 2-part models, and unfortunately "2-part" is an ambigious search 
term, so none of the usual search tools have been helpful. However, I 
did find the package -tpm- on SSC which estimates a 2-part GLM model, 
but before I start trying to see what I can infer from the source code 
that might extend to say -gllamm-, I thought I would ask the list if 
anyone else has information, or even a better search term, for 2-part 
random effects GLM models.

Some additional context might be helpful. My particular situation is 
that an economist colleague handed me a paper:

 Liu, Lei & Strawderman, Robert L. & Cowen, Mark E. & Shih, Ya-Chen T.,
 2010. "A flexible two-part random effects model for correlated medical
 costs," Journal of Health Economics, Elsevier, vol. 29(1), pages
 110-123, January.
 ( http://ideas.repec.org/a/eee/jhecon/v29y2010i1p110-123.html )

and pointed out it was just the thing for a problem we'd been working 
on. The paper includes SAS code using NLMIXED (wherein I discovered that 
NLMIXED allows one to write one's own likelihood function) - and what 
I'm trying to avoid is moving this project to SAS for want of a model.

In sum - is there a better (more specific) name for 2-part models, or 
any implementation in Stata other than the -tpm- package?

thanks,
Jeph

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