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RE: st: Perfect predictors of an occurrence (survival analysis)


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   RE: st: Perfect predictors of an occurrence (survival analysis)
Date   Thu, 13 Mar 2008 14:41:12 +0000 (GMT)

--- Luis Ortiz <luis.ortiz@upf.edu> wrote:
> The problem is that some of my covariates, seemingly, do not change
> their value during t. The type of contract does not change while the
> individual holds a job for which s/he is over-educated.
> 
> In other words, the type of contract perfectly predicts my outcome
> 
> As you'll see next, whenever I run the model with sex and age
> dummies, everything is OK. Yet, if I add to the model the 
> type-of-contract dummies....

I don't know the answer, but I think I can eliminate one potential
cause, which I hope is sorta helpful. You claim the the prolem is that
the contract doesn't change over time. This can't be  the problem,
because you report that the model works OK when you add sex, and this
presumably doesn't change over time either. 

Hope this helps,
Maarten


-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands

visiting address:
Buitenveldertselaan 3 (Metropolitan), room Z434

+31 20 5986715

http://home.fsw.vu.nl/m.buis/
-----------------------------------------


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