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Re: st: Discrete-time survival analysis data setup


From   "Lucy @ Mac" <gihund@mac.com>
To   Statalist <statalist@hsphsun2.harvard.edu>
Subject   Re: st: Discrete-time survival analysis data setup
Date   Thu, 15 Mar 2007 21:49:32 +1100

Hi,

I've been working on a set of data using survival analysis too. I hope this
suggestion helps.

To create entry and exit times, all I did was create new columns, renamed as
required for specific times. For my study, I needed to examine animals
leaving the herd in one month periods. So I created (entry31) (exit60) some
such columns. And when I stset, I put in stset xyz, id() failure(censorX)
entry(entry31) exit(exit60). It seems to work well.

Hope this helps.

Lucy


On 15/3/07 3:32 AM, "sara khan" <sarakhanum84@googlemail.com> wrote:

> Dear Statalisters
>
> I am new to Stata and and am working on a discrete time survival
> analysis of unemployment transitions.
>
> I wish to model the exits out of and re-entries into unemployment as
> two separate models. I have read Stephen Jenkins's
> course manuals, which were a fantastic learning resource, however, I
> am unsure of what syntax to use to create my dependent variables:
>
> 1. Unemployment exit = 1 if a spell of unemployment ends at t-1 and
> individual becomes employed at t, 0 =remains unemplyed and conditional
> upon the first unemployment spell being observed;
> 2. Unemployment entry =1 if a spell of employment ends and individual
> enters unemployment, 0=remains employed; conditional upon the first of
> the spells before entry occurring being observed.
>
> I have twelve annual panel waves and am using an unbalanced sample.
> For unemployment duration, I have created variables for the spell year
> (t), the spell number, when the spell ended, duration of spell, and
> whether it is censored. Below is an example.
>
> My question is how I create the exit and re-entry dependent variables.
> I am unsure because there are multiple spells per individual in some
> cases but I pnly want to model single spells. Also, I am not sure how
> to condition these variables upon delayed entry as some spells began
> before wave 1.
>
> Any help would be appreciated. Thanks in advance.
>
> Sara
>
>
>
> ID wave unempd     t            spell num  spell end    duration   cens'd
> 1 1 1 1 1 1 1 1
> ------------------------------------------------------------------------------
> ------------------------------------
> 2 1 1 1 1 1 1 0
> 2 2 0 2 0 0 0 0
> ------------------------------------------------------------------------------
> -----------------------------------
> 3 1 1 1 1 1 1 0
> 3 2 0 2 0 0 0 0
> 3 3 1 3 2 1 1 1
> ------------------------------------------------------------------------------
> -----------------------------------
> 8 2 0 1 0 0 0 0
> 8 4 0 2 0 0 0 0
> 8 7 1 3 1 0 2 0
> 8 8 1 4 1 1 2 0
> 8 9 0 5 0 0 0 0
> 8 10 0 6 0 0 0 0
> 8 11 1 7 2 1 1 0
> 8 12 0 8 0 0 0 0
> ------------------------------------------------------------------------------
> ------------------------------------
> 10 1 0 1 0 0 0 0
> 10 2 0 2 0 0 0 0
> 10 3 0 3 0 0 0 0
> 10 4 0 4 0 0 0 0
> 10 6 1 5 1 1 1 0
> 10 8 0 6 0 0 0 0
> 10 10 0 7 0 0 0 0
> 10 11 1 8 2 1 1 0
> 10 12 0 9 0 0 0 0
> *
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