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st: Weibull model with censored data


From   <guh@email.unc.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: Weibull model with censored data
Date   Wed, 09 Oct 2002 12:02:06 -0400

Dear friends,

My data is a kind of cesored data. Some of them are left-censored,
right-censored, and others interval like the below.

lower
upper
500
 .
 .	7500
 .	7500
5000
60000
 .	20000
10000
20000
 .	20000
20000
 .
 .	20000
 .	500
 .	500
5000
 .
3000
 .

I want to know mean/median value and standard error by fitting the
parameters to Weibull model. When I tried <stset>, <streg> or <weibull>
in the commands of survival-time analysis, STATA didn't identify the
left-censored and right-censored data. If there is no way to handle
left-censored data, I can replace <.> in the left with the number of
0.1. Still there was some problem with right-censored data. STATA
analyzed only interval data. I can't go agead further. Is there someone
who has analyzed censored data? 
Please, help me, I really appreciate it. 
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