Your data should look something like this
id t leave
1 1 0
1 2 0
1 3 1
2 1 1
3 1 0
3 2 0
3 3 0
etc.
In case of panel data this is often called long format, in case of
survival data this is often requires the use of -expand-. This is
discussed in detail in lecture 6 of:
http://www.iser.essex.ac.uk/teaching/degree/stephenj/ec968/
Hope this helps,
Maarten
--- Luis Ortiz <[email protected]> wrote:
> 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-----
> De: [email protected]
> [mailto:[email protected]] En nombre de Maarten
> buis
> Enviado el: jueves, 13 de marzo de 2008 13:38
> Para: [email protected]
> Asunto: Re: st: Perfect predictors of an occurrence (survival
> analysis)
>
> What commands are you using?
>
> --- Luis Ortiz <[email protected]> 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
> >
> > *
> > * For searches and help try:
> > * http://www.stata.com/support/faqs/res/findit.html
> > * http://www.stata.com/support/statalist/faq
> > * http://www.ats.ucla.edu/stat/stata/
> >
>
>
> -----------------------------------------
> 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/
> -----------------------------------------
>
>
> __________________________________________________________
> Sent from Yahoo! Mail.
> The World's Favourite Email http://uk.docs.yahoo.com/nowyoucan.html
> *
> * For searches and help try:
> * http://www.stata.com/support/faqs/res/findit.html
> * http://www.stata.com/support/statalist/faq
> * http://www.ats.ucla.edu/stat/stata/
>
> *
> * For searches and help try:
> * http://www.stata.com/support/faqs/res/findit.html
> * http://www.stata.com/support/statalist/faq
> * http://www.ats.ucla.edu/stat/stata/
>
-----------------------------------------
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/
-----------------------------------------
__________________________________________________________
Sent from Yahoo! Mail.
The World's Favourite Email http://uk.docs.yahoo.com/nowyoucan.html
*
* For searches and help try:
* http://www.stata.com/support/faqs/res/findit.html
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
