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Re: st: RE: using value of one variable to read value of specific other variable out of a list of variables


From   arne.weiss@uni-erfurt.de
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: using value of one variable to read value of specific other variable out of a list of variables
Date   Mon, 09 May 2011 19:52:33 +0200

Nick Cox schrieb:
gen z = cond(y == 1, x1, cond(y == 2, x2, x3)) Nick n.j.cox@durham.ac.uk
arne.weiss@uni-erfurt.de

I want to create a variable (z) that contains the value from one variable out of a list of variables (say x1 - x3) depending on the valuable of another variable (y). The list of variables is a) named in a way that the value of y could be used to refer to the correct name of the variable and b) ordered so that the value of y could also be used a locational reference (as the offset command does in Excel). I don't think b) could work in STATA, but I couldn't find a solution for a) either. See below an example. Therein, z in the first row is supposed to be 1 and in the second row 5 (if y = 2, z is supposed to have the value of x2).

x1    x2    x3    y
1    2    3    1
0    5    4    2

Here is the closest I came towards a solution:
local a = y
gen z = x`a'

This command, however, only does half the job as the value of the local a is not being rest for every row. I would be very happy for any advice.


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Thanks, Nick. That is already much better than repeated if qualifiers. However, my actual set of variables is longer than 3 variables, and I have the same type of problem several times in my data-set. Before doing it "brute force", would you happen to know a more "elegant" solution? Thanks already anyway!
Best
Arne

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Dr. Arne Robert Weiß
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