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Re: st: RE: if command

From   Cameron Hooper <[email protected]>
To   [email protected]
Subject   Re: st: RE: if command
Date   Tue, 18 Jan 2005 13:25:13 -0500

Nick Cox wrote:
-if- as a keyword is overloaded. The two ways of using -if- you exemplify
are not equivalent -- unless you have
single observation datasets.
I have not been clear. I apologise. I completely agree that code should be readable.

Let me explain. I am not looking for a way to exploit some unique aspect of my data to make my code more efficient. So for example,

gen var1 = (fpi == "big") + 2 * (fpi == "small")

works, but only for these particular values.

I am asking a more general question. In stata can I test a condition and as a result of this single test generate (or replace) more than one variable? All of Nick's examples generated one variable as the result of testing one logical expression. In Fortran I can write:

Y = 12
Q = 78

Test once, set two variables. The only way I know to do this in stata is

gen y = 12 if x == 10
gen q = 78 if x == 10

I have to test x twice. Is there a way in stata to only test the condition once? I understand that "if exp {}" will not work.


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