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Re: st: Discrete time hazard model - Interval width


From   Steve Samuels <sjsamuels@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Discrete time hazard model - Interval width
Date   Tue, 18 May 2010 11:04:09 -0400

-
Giuliana-

You can use intervals of unequal lengths for a discrete or, in your
case, grouped, survival analysis. But exactly what information on job
history was obtained at each interview?

If you obtained  more specific information the date of the first real
job,  use that information to define your time variable.  For people
who had never gotten a "real job",  the  last observed interview will
serve to define censoring points.

Stephen Jenkins has some excellent resources about survival analysis.
http://www.iser.essex.ac.uk/study/resources/module-ec968
including his Lecture notes:
http://www.iser.essex.ac.uk/files/teaching/stephenj/ec968/pdfs/ec968lnotesv6.pdf

Steve

On Tue, May 18, 2010 at 8:51 AM,  <gideluca@unical.it> wrote:
> Dear Stata Users,
>
> We are assessing the transition from university to the first real job,
> taking into account individual characteristics and the family background. We
> use survey data including graduates from the summer sessions in the year
> 2004 who were interviewed at one, three and five years from graduation.  In
> order to carry out the analysis we estimate a discrete time hazard model. We
> have organised the data in such a way that for each student there are as
> many data rows as there are time intervals over which the student is at risk
> of finding the first job. Is it correct to use intervals of different width
> (0-1; 1-3; 3-5)  given that we do not have yearly interviews?
>
>
>
>        +-----------------------+
>        id   studytim   dead
>        -----------------------
> 279.    182          2      0
> 280.    182          2      1
> 281.    183          3      0
> 282.    183          3      0
> 283.    183          3      1
>        -----------------------
> 284.    184          1      1
> 285.    185          3      0
> 286.    185          3      0
> 287.    185          3      1
> 288.    186          3      0
>        -----------------------
> 289.    186          3      0
> 290.    186          3      0
>        +-----------------------+
>
> Thank you very much.
> Giuliana
>
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-- 
Steven Samuels
sjsamuels@gmail.com
18 Cantine's Island
Saugerties NY 12477
USA
Voice: 845-246-0774
Fax:    206-202-4783

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