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st: generating a new variable with the egen command


From   agostino@unical.it
To   statalist@hsphsun2.harvard.edu
Subject   st: generating a new variable with the egen command
Date   Mon, 28 Nov 2005 15:53:34 +0100

Dear all,
I'm trying to generate a new variable given by the sum of an existing variable 
by year (as I have 2 six month observations for the same year) and individual.
The command is the following:
egen newvar=sum (oldvar), by(id year)

the problem is that the original values are, for instance: 42224464 and 
67090781, but the sum that STATA computes is 109000000, instead of 109315245. 
Why does it round like that?
The old variable is stored as “double”, I have tried to change the storage 
type, using recast, but STATA does not allow to do it, as many values would be 
changed...
Thank you very much for any suggestions
Kind regards

Mariarosaria Agostino

Dipartimento di Economia e Statistica
Università della Calabria
ponte P. Bucci, 87036 Arcavacata di Rende (CS)
Italia




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