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st: survival analysis : computation of rate with spell data


From   pwetpublic@free.fr
To   statalist@hsphsun2.harvard.edu
Subject   st: survival analysis : computation of rate with spell data
Date   Sat, 13 Jul 2013 16:17:48 +0200 (CEST)

Hello !

How I can compute the unemployment rate with spell data ? 

I'm using Stata 12 for linux.

Here are my data (spells) :

id | Unemployment | begin | end  | duration (=end-begin+1)
1      0              0     15        16
1      1              16    80        65
1      0              81    132       52
2      1              0     25        26
2      0              26    132       107

The end time is 132 (11 years x 12 months). 

What I want is something like that : 
id | Unemployment | begin | end  | duration | Unemployment rate
1      0              0     15       16            0,5 (because between 0 and 15 the second individual is unemployed)
1      1              16    80       65            0,57  = [1*(25-16+1) + 0,5*(80-26+1)]/65
1      0              81    132      52            0 (because between 81 and 132 nobody is unemployed)
2      1              0     25       26            0,69 (= [50%*(15+1) + 100%*(25-16+1)]/26
2      0              26    132      107           0,25 (= [0,5*(80-26+1) + 0*(132-80+1)]/107)


The first solution I see is reshaping into time data (with one observation for each month), but I have too much variables, so that my computer cannot reshape.
And I don't see a second solution :p

Do you know how I can compute this ? Is there an function with stata ?

Thanks a lot !

Pierre
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