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Re: st: Analysis of event history data


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Analysis of event history data
Date   Mon, 19 Mar 2012 11:42:57 +0000

For most Stata purposes your data would indeed be better reshaped to a
long data structure or shape or form (some people do say "format", but
in a Stata context format implies -format-, etc.).

reshape long y_ , i(id) j(time)
rename y_ status

should do it. See also -tsspell- (SSC) and

SJ-7-2  dm0029  . . . . . . . . . . . . . . Speaking Stata: Identifying spells
        . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  N. J. Cox
        Q2/07   SJ 7(2):249--265                                 (no commands)
        shows how to handle spells with complete control over
        spell specification

as well as the literature on survival analysis with which you are
evidently familiar.

Nick

On Mon, Mar 19, 2012 at 11:32 AM, Kristian Thor Jakobsen <KRJ@dm.dk> wrote:

> I am trying to do an analysis of transition in and out of public income
> transfers. My data is organized roughly the following way:
>
> Id      y_1001  y_1002  y_1003
> 1       0       1       0
> 2       0       0       0
> 3       1       1       0
>
> This means that I have the weekly status of each individual from 1991 to
> 2011. But in order to any sort of analysis I would guess that I had to
> convert the data into the following way instead (for example survival
> analysis):
>
> Id      Status  Time
> 1       0       1
> 1       1       2
> 1       0       3
> 2       0       1
> 2       0       2
> 2       0       3
> 3       1       1
> 3       1       2
> 3       0       3
>
> Is that correct, and if so, does there exist a smart way to convert the
> data from one format into the other? Or can I perhaps use the data as
> given?
>

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