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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 <[email protected]>
To   "'[email protected]'" <[email protected]>
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 
[email protected] 

[email protected]

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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