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Re: st: Identifier from three variables


From   "Svend Juul" <SJ@SOCI.AU.DK>
To   <statalist@hsphsun2.harvard.edu>
Subject   Re: st: Identifier from three variables
Date   Fri, 27 Jul 2007 20:22:29 +0200

Nádia wrote (via Nick):
 
How can I generate an identifier from three variables? 
In my data I have a column for the house, one for the family and one for the individual
 
example:
house     family   individual
1                 1         1
1                 1         2
1                 1         3
2                 1         1
2                 1         2
...
 
and I would like to know how can I create an identifier per individual such as:
 
individual
010101
010102
010103
020101
...
 
-------------------------------------------------------------
 
Nick immediately advised against creating a composite identifier.
In my experience, it can sometimes be quite useful. Here Nádia could:
 
   egen id = concat(house-individual), format(%02.0f)
 
For this to work, there must be no missing values in the original
identifiers. If there are, things get messy.
 
Hope this helps
Svend
 
________________________________________________________ 
 
Svend Juul
Institut for Folkesundhed, Afdeling for Epidemiologi
(Institute of Public Health, Department of Epidemiology)
Vennelyst Boulevard 6 
DK-8000 Aarhus C,  Denmark 
Phone, work:  +45 8942 6090 
Phone, home:  +45 8693 7796 
Fax:          +45 8613 1580 
E-mail:       sj@soci.au.dk 
_________________________________________________________ 

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