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

 From Nick Cox To "'statalist@hsphsun2.harvard.edu'" Subject st: RE: using value of one variable to read value of specific other variable out of a list of variables Date Mon, 9 May 2011 18:34:40 +0100

```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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