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st: RE: Changing positive values to negative in Stata


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Changing positive values to negative in Stata
Date   Thu, 20 Apr 2006 21:22:56 +0100

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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