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
[email protected]
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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