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Re: st: Creating a variable with the highest value from two other variables


From   "Joseph Coveney" <jcoveney@bigplanet.com>
To   "Statalist" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: Creating a variable with the highest value from two other variables
Date   Sat, 13 Oct 2007 15:59:42 -0700

Christer Thrane wrote:

I have two income measures, X and Y. I want to create a variable, Z, that is
equal to X for those obs where X>=Y and equal to Y for those obs where Y>X.
Like this:

id    X    Y       Z
1    12    11    12
2    10    10    10
3    10    12    12

Is there a simple way?

--------------------------------------------------------------------------------

You can use -cond()-.  You can nest -cond()-s to handle missing values.

See also -egen-.

Joseph Coveney

clear *
input byte id byte X byte Y byte Z
1    12    11    12
2    10    10    10
3    10    12    12
end
assert !missing(X) & !missing(Y)
generate byte Zstar = cond((X >= Y), X, Y) // Here
assert Zstar == Z
exit


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