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st: problem with expected duration


From   "Ellen Van de Poel" <vandepoel@few.eur.nl>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: problem with expected duration
Date   Mon, 18 Sep 2006 12:14:13 +0200

Dear Stata users,

I am using a duration model to explain childhood mortality (dying before 5
years of age).
The duration time ranges from 0 to 60 months. A failure dummy indicates
whether or not the child has died before 60 months.

I use: “streg $xvars , dist(lognormal)”

Thereafter I want to calculate expected durations. To do so I use “predict
meanpredct, mean “.

Now, the problem is that these predicted durations are too big, they range
from 102738.1  to  1.33e+09. They can't be interpreted as expected
durations?

Could someone give me an idea on what I am doing wrong?

Thanks a lot in advance,
Ellen Van de Poel



____________________________________________________________________________
______________________________
Ellen Van de Poel 
 
Department of Applied Economics
Erasmus School of Economics and Business Economics 
Erasmus University Rotterdam 
Burg. Oudlaan 50  
3000 DR Rotterdam 
The Netherlands
Room H13-09
T: +31 (0) 10 408 15 02
F: +31 (0) 10 408 91 41
E : vandepoel@few.eur.nl



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