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Re: st: how to distinguish observations with the same code

From   "natalie chan" <>
Subject   Re: st: how to distinguish observations with the same code
Date   Mon, 7 May 2007 14:13:39 +0100

Dear Johannes,

Thanks so much for your quick reply.

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


On 5/7/07, Johannes Geyer <> wrote:
Dear Natalie,

you could just create a variable "country" in both data sets with "1" for
country a and "2" for b, afterwards you append the data. Then you can
identify each observation as a combination of "code" and "country" - so
you could also generate a new identifier.


Dear statalisters,

 This may be an elementary question but I could not find a solution in
Stata and the list archives, so here I am.

 I am working with two large datasets, each including more than
100,000 firms from two countries respectively. Each firm is assigned a
code number. so the structure of both datasets is as follows:

Code   sales profit turnover

1              3        4         6

2              3        5         6

3              7        4         2


1000000   4       5         8

 I have put the two datasets into one dataset using "Append", however,
how can I distinguish the firms from different regions since they have
the same code? Is it possible to generate a new variable with the
prefix before the code, for example, "german1"  "france1" etc.?


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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