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st: AW: creating expanded records with indicator variables, where different ID's reside in the same rows


From   "Martin Weiss" <[email protected]>
To   <[email protected]>
Subject   st: AW: creating expanded records with indicator variables, where different ID's reside in the same rows
Date   Wed, 21 Oct 2009 19:24:37 +0200

<> 



This looks non-trivial, but -stack- might be a good place to start...



HTH
Martin

-----Ursprüngliche Nachricht-----
Von: [email protected]
[mailto:[email protected]] Im Auftrag von Michael
McCulloch
Gesendet: Mittwoch, 21. Oktober 2009 19:12
An: Statalist Statalist
Betreff: st: creating expanded records with indicator variables, where
different ID's reside in the same rows

Hello,
I have a data structure that has been gathered as follows, where each  
cell contains the subject ID if A is true, and similarly for B.  
Therefore, for subject 5, I have A=yes and B=yes, whereas for subjects  
6 and 11, only B=yes.

A	B
5	5
6	11

I'd like to transform the data structure such that each row would have  
ID, and indicator variables for A and B.
id	A	B
5	1	1
6	0	1
11	0	1

I've tried an approach like this, where I create indicator variables  
but A and B, but am not sure how to "expand" from  the data structure  
where different ID's reside in the same rows.
	. gen id1=a
	. gen id2=b
	. gen aa=1 if a!=.
	. gen bb=1 if b!=.

It also looks like -reshape- is not suitable because different ID's  
reside in the same rows.
Any advice would be appreciated.



Michael McCulloch
Pine Street Foundation
124 Pine Street
San Anselmo, CA 94960-2674
tel:	415-407-1357
fax: 	206-338-2391
[email protected]






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