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st: Re: RE: RE: Identifier from three variables


From   "Nádia N. Simőes" <nadia.simoes@iscte.pt>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Re: RE: RE: Identifier from three variables
Date   Mon, 30 Jul 2007 15:06:06 +0100

my mistake. do not consider the previous email
----- Original Message ----- From: "Rafael Osorio" <rafael.osorio@undp-povertycentre.org>
To: <statalist@hsphsun2.harvard.edu>
Sent: Monday, July 30, 2007 1:45 PM
Subject: st: RE: RE: Identifier from three variables




Other way of doing it, supposing each identifier is <= 99:

gen id = house*1000+family*100+individual

By doing it this way you can tell to which house and family a specific person belongs to. If your data was not sorted by the identifiers, if you sort by this new identifier the result will be equal to sorting it by all identifiers. If your final id is large: gen double id...

If your identifiers are greater than 99, adjust the multipliers.

Rgds,

Rafael

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Nick Cox
Sent: Friday, July 27, 2007 2:09 PM
To: statalist@hsphsun2.harvard.edu
Subject: st: RE: Identifier from three variables

I'll answer this myself:

1. Don't do that. Use -egen, group()- with the -label- option.

2. See also

FAQ . . . . . . . . . . . . . . . . . . . . . . Creating group identifiers
3/01 How do I create individual identifiers numbered
from 1 upwards?
http://www.stata.com/support/faqs/data/group.html

3. If you really must, look into -egen, concat()-, including
its options.

Nick
n.j.cox@durham.ac.uk

Nádia N. Simőes

 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
...
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