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st: Discrete time duration model with heterogeneity: xtcloglog and pgmhaz


From   Silvia Mendolia <silvia.mendolia@student.unsw.edu.au>
To   statalist@hsphsun2.harvard.edu
Subject   st: Discrete time duration model with heterogeneity: xtcloglog and pgmhaz
Date   Tue, 09 Dec 2008 14:20:29 +1100

Dear all,

I am running a discrete time duration model including unobserved heterogeneity.
I tried to run it with xtcloglog (assuming Normal distributed errors) and with 
pgmhaz (Gamma heterogeneity).
The thing that worries me is that I am getting very different results, 
especially for some selected covariates. Particularly, some variables that have 
significant coefficient with xtcloglog are not significant with pgmhaz.
I wonder how I could choose the right model for my data.

Any suggestions?

Thank you very much,

Silvia
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