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st: missing event times in st data

From   Stas Kolenikov <>
Subject   st: missing event times in st data
Date   Tue, 18 Jun 2002 07:36:43 -0400 (EDT)

Dear Statalisters,

I have an annual study where people report their status (employed / 
unemployed). It is not always asked when the transition from one state
to another had happened. What can I do to smartly (hm...) assign
the initiating and terminating times? A simple thing to do is to 
take the middle of the interval as the time of change. A better thing
might be to integrate out the missingness in the style of EM algorithm.
Can anybody provide a reference to what can be / should be / sometimes
is done?

 ---                                    Stas Kolenikov
 --       Ph.D. student in Statistics at UNC-Chapel Hill
 -  --

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