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RE: st: how to summarize while accounting for duplicate values


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: how to summarize while accounting for duplicate values
Date   Mon, 22 Feb 2010 11:20:35 -0000

-egen- here is a typo for -gen-. 

Nick 
n.j.cox@durham.ac.uk 

Jeph Herrin

If your individuals are identified by the variable -id-,
then create an indicator for one record per -id-:

   bys id: egen first=_n==1

Then all you have to do is condition on -first-

  sum birthday if first

to get summary stats on one record per individual.

dstahler@ucla.edu wrote:

> I am trying to summarize a dataset in Stata 10.1 on individuals' 
> reproductive success throughout their life. The database is set up
with 
> each individual having an annual entry with multiple variables. Some 
> variables' values change annually (e.g. # offspring born), while other

> variables have duplicated values for each year as they do not change 
> over the course of their life (e.g. age of first reproduction, 
> lifespan). How do I get Stata to provide summary statistics for chosen

> variables of interest in the population that accounts for individuals'

> duplicated values for some variables that don't change annually?

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