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Re: st: firm survival analysis--non-continuous time

From   "Eric G. Wruck" <>
Subject   Re: st: firm survival analysis--non-continuous time
Date   Mon, 18 Apr 2005 20:19:23 -0400

As an aside, can you distinguish between non-survivorship & the failure to respond to the survey?  Also a small firm may have been acquired & is thriving as part of a larger organization -- that would seem different from non-survivorship.


>I have data on 1000 small firms from a survey that was administered in
>1990.  The survey had 140 questions answered by the entrepreneurs
>That same interview was administrered exactly a year later in 1991 to
>only those firms who survived/continued from the original 1000
>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.
>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?



       Eric G. Wruck
       2535 Sherwood Road
       Columbus, OH  43209

       ph:      614.231.5034
       cell:    614.327.4182
       fax:     614.231.5039
       eFax:    614.573.6639

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