> -----Original Message-----
> From: Natalja Guz-Nagrebecka [mailto:[email protected]]
> Sent: 29 March 2005 09:46
> To: [email protected]
> Subject: st: Survival Analysis Issue
>
>
> Dear Professor Stephen P. Jenkins,
>
> I am using stata to do survival analysis. I am interested in
> estimating
> poverty persistence.
>
> By following Professor Stephen P. Jenkins notes and codes and
> using duration
> data I got the following results.
>
> Step 1: stset: Declare data to be survival-time data
>
> stset time, id(id) failure(poverty)
> [time=year; poverty==1 if low income]
>
> Original panel data:
>
> time id poverty
> 1997 1 0
> 1998 1 1
> 1999 1 1
> 2000 1 1
>
> STATA after stset:
>
> time id poverty _st
> _d
> _t _t0
> 1997 1 0 1
> 0
> 1997 1996
> 1998 1 1 1
> 1
> 1998 1997
> 1999 1 1 0
> -
> 1999 1998
> 2000 1 1 0
> -
> 2000 1999
>
>
> But poverty is not death.
[But neither is it very pleasant for those who experience it.]
Natalja need not use -stset-. The set-up in her data evidently refers to
discrete-time rather than continuous time (which is the assumption made
by the -st- suite of commands). In the data shown the observation with
id==1 has a right-censored spell three years long that began in 1998.
She could look at the -discrete- entry in the [ST] Manual or, in more
gory detail, at the sections on discrete-time analysis in my Survival
Analysis manuscript and the associated Stata lessons (at
http://www.iser.essex.ac.uk/teaching/degree/stephenj/ec968/).
Stephen
-------------------------------------------------------------
Professor Stephen P. Jenkins <[email protected]>
Institute for Social and Economic Research
University of Essex, Colchester CO4 3SQ, U.K.
Tel: +44 1206 873374. Fax: +44 1206 873151.
http://www.iser.essex.ac.uk
*
* 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/
