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Re: st: missing event times in st data


From   sorensen@mit.edu
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: missing event times in st data
Date   Tue, 18 Jun 2002 11:06:33 -0400

Trond Petersen has written some papers on time aggregation bias, which is what 
this sounds like, somewhere in the sociological methods journals.  That might 
be a place to start.


Quoting Stas Kolenikov <skolenik@email.unc.edu>:

> 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
>  - http://www.komkon.org/~tacik/  -- Stas.Kolenikov@unc.edu
> 
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