
From  Suzy <scott_788@wowway.com> 
To  statalist@hsphsun2.harvard.edu 
Subject  Re: st: RE: Changing positive values to negative in Stata 
Date  Thu, 20 Apr 2006 16:55:08 0400 
replace suzy = suzy if suzy > 0 & <whatever>
So if suzy is positive, it is negated. The crunch is specifying the extra condition <whatever> that catches just the observations desired.
Sorting is a red herring here. So long as you can specify which observations you want, sort order
is immaterial.
Nick n.j.cox@durham.ac.uk
Suzy
I have a continuous variable with positive, negative, and zero values and also missing values(.). I would like to know if anyone has an easy Stata code/command to change just the positive values to a negative (change the sign: 4.4567 to 4.4567) for just a particular subgroup of the total (n=661 out of over N=4,000). Within this subgroup (which I can sort, but not by id) there already are a few appropriately negative values in place.*
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