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

From   "Luis Ortiz" <>
To   <>
Subject   RE: st: Perfect predictors of an occurrence (survival analysis)
Date   Thu, 13 Mar 2008 13:44:14 +0100

Dear Maarten,

Thanks for the quick response.

Initially, since I only have discrete time data, I was using cloglog, but,
as I said, the analysis was... rejected, since type-of-contract dummies turn
out to be perfect predictors of the outcome.

Thanks for your attention again

Luis Ortiz

-----Mensaje original-----
[] En nombre de Maarten buis
Enviado el: jueves, 13 de marzo de 2008 13:38
Asunto: Re: st: Perfect predictors of an occurrence (survival analysis)

What commands are you using?

--- Luis Ortiz <> wrote:

> Dear Statalisters,
> I'm analysing the occurrence of the following event: getting out of
> employment if you are over-educated. I'm doing so for a number of
> over-educated individuals, using panel data. The spells are the
> periods in
> over-education.
> I am especially interested by the type of contract. This is one of my
> main
> independent variables. Therefore, I have split the initial variable
> in the
> corresponding dummies, in order to include them in the analysis. Yet,
> I have
> found that each one of these dummies perfectly predict the occurrence
> of the
> event I'm studying. It might be because the spells are not very long
> and the
> job, no matter how over-qualified it is, goes associated with a given
> type
> of contract. In other words, the type of contract does not change
> during the
> spell.
> In such a case, dummy covariates on type of contract are not feasible
> for
> the analysis. They perfectly predict the occurrence of the event.
> Yet, this does not mean that over-educated workers are equally likely
> to get
> out of employment REGARDLESS of their type of contract. Moreover, I
> suspect
> that the type of contract may be associated to a different likelihood
> of
> getting out of the employment.
> How could I overcome the problem I have mentioned for running
> survival
> analysis? Is there any alternative way to estimate the relative
> likelihood
> of temporary / permanent over-educated workers quitting their jobs
> that you
> come up with?
> I do appreciate your attention
> Best regards
> Luis Ortiz
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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

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