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# st: 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 st: using value of one variable to read value of specific other variable out of a list of variables Date Mon, 09 May 2011 19:30:05 +0200

```Dear everyone,

```
I am sure there is some obvious solution that I am not seeing, but I couldn't figure it out: 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.
```
Arne

--
Dr. Arne Robert Weiß
```
University of Erfurt Nordhäuser Str. 63, D-99089 Erfurt Tel: +49 361 737 4522
```Fax: +49 361 737 4569
```
http://www.uni-erfurt.de/mikrooekonomie/lehrstuhlteam/dr-arne-weiss http://arneweiss.blogspot.com
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```