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st: firm survival analysis--non-continuous time


From   Shon Hiatt <shon.hiatt@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: firm survival analysis--non-continuous time
Date   Mon, 18 Apr 2005 16:40:27 -0400

BACKGROUND
I have data on 1000 small firms from a survey that was administered in
1990.  The survey had 140 questions answered by the entrepreneurs
themselves.
 
That same interview was administrered exactly a year later in 1991 to
only those firms who survived/continued from the original 1000
(N=600).
 
The interview was again administered three years later in 1994 to
firms that continued to exist from the original 1000 (N=350).
 
I don't have information of when the firms disappeared/died; I only
know that at some point between the administration of the 1st and 2nd,
and the 2nd and 3rd surveys that some disappeared.  There is a firm
identification number to track the firms that survived. I also don't
have data on firms that disappeared--only on those that survived.
 
I am using the variables to explain survival. 
 
QUESTION:
What is the best way to go about a survival analysis like this where 
Time=1, 2, 4 and I don't know eactly when the firms disappeared
between the time intervals?
 
 
Thanks,
Shon

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