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Re: st: Hazard model with multiple entry AND time varying controls?


From   Nick Eubank <nickeubank@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Hazard model with multiple entry AND time varying controls?
Date   Thu, 2 Feb 2012 11:54:20 -0800

Hi Steve,

The difficulty I'm having is that if I split countries out to one line
per observation (variables all change by year) and identify a country
by its country id, then it only analyzes the first failure. If I split
the country out and give it a different id for each time it goes
through a failure cycle then I'm gonna get issues since STATA doesn't
recognize that its the same country failing repeatedly. Am I just
missing an obvious command to adjust this, or is it a fundamental
problem with stcox and stset?

Austin, that package looks very promising! Thanks!

Nick

On Thu, Feb 2, 2012 at 4:58 AM, Steve Samuels <sjsamuels@gmail.com> wrote:
>
>
> Although the examples in the FAQ have one record per spell and person, you can use Stata's usual techniques for accommodating time-varying covariates. Here is a line of data from Section 3.2.4 of the FAQ entry:
>        id     group   time0   time   status   number   size   str |
>   4. |  4   placebo       0     10        0        5      1     1
>
> If covariates change between 0 & 10, you  split the follow-up time into spans within which they are constant. See the multiple-record examples in the manual entry for -stset-; the final section "Using survival time data in Stata";  the examples in the entry for -stsplit-; and the sections on time-varying covariates in the manual entry for -stcox-.
>
> Steve
> sjsamuels@gmail.com
>
> On Feb 1, 2012, at 7:56 PM, Nick Eubank wrote:
>
> Hi all,
>
> Trying to run a hazard model with multiple ordered entry and time
> varying controls. The only help I could find is this:
> http://www.stata.com/support/faqs/stat/stmfail.html , but it doesn't
> seem able to accommodate data in my format (where each individual has
> different control variables for each year and can't be collapsed to a
> single year).
>
> To be specific, I have a time series of country regimes, and am
> modeling transition from democracy to autocracy. Some countries "fail"
> repeatedly after returning to democratic status. Control variables
> (like income) are
> time varying so I can't collapse to one line per event with an entry and
> exit variable.
>
> Any suggestions?
>
> Thanks in advance!
>
> Nick
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