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st: how to distinguish observations with the same code

From   Johannes Geyer <>
Subject   st: how to distinguish observations with the same code
Date   Mon, 7 May 2007 15:50:04 +0200

as far as I understood the problem, you did not create string variables. 
if it is just a cross-sectional data set,  you could generate a simple 
index as identifier:
gen x = _n

>sacrificial lamb
>Natalie wrote
>I have actually created a new variable country to distinguish the
>firms before appending, I am wondering if it is possible to create a
>new variable combining the information of "code" and "country", so
>that the observations can be distinguished by one variable? Thanks
>This is a FAQ.
>gen idcode = country + string(code)
>If you want a fixed length code (assuming countrycode is of fixed 
>length, e.g. ISO) then use string(code,"%9.0f") or something like that.

Johannes Geyer
Deutsches Institut für Wirtschaftsforschung (DIW Berlin)
German Institute for Economic Research 
Graduate Center
Koenigin-Luise-Straße 5
14195 Berlin, Germany 
Tel: +49-30-89789-258

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