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Re: st: stset for grouped data


From   Joerg Luedicke <joerg.luedicke@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: stset for grouped data
Date   Wed, 13 Apr 2011 14:18:29 -0400

On Wed, Apr 13, 2011 at 12:06 PM, Dherani, Mukesh
<M.K.Dherani@liverpool.ac.uk> wrote:
> Dear Stata experts,
> I have grouped data and want to estimate incidence rate each year.  How can I set 'stset' when I don't have individual level data.  Do I need to expand data with certain assumptions?
>
> region year agegp cases population
> 1 1994 0-4 2 5000
> 1 1994 5-9 5 2548
> 1 1994 10-14 6 2547
> 1 1994 15-19 15 7521
> 1 1994 20-24 75 7896
>
What do you mean with "grouped"? Is this some aggregate measure from
individual persons? I guess if you do not have data from those
individual persons, you do not have it. I do not know how this
information would emerge by any form of expanding? You probably need
to check if your groups are a reasonable unit of analysis and then do
the analysis for those groups.

J.

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