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RE: st: RE: Requirement(s) for a match merge


From   David Kantor <dkantor@jhu.edu>
To   statalist@hsphsun2.harvard.edu
Subject   RE: st: RE: Requirement(s) for a match merge
Date   Wed, 30 Mar 2005 12:48:38 -0500

At 05:34 PM 3/30/2005 +0000, Louis wrote:
Perhaps an example will clarify my concern. Suppose we have the following datasets, where -id- (the identifier) represents family code:
Dataset1
id father
1. 1 John
2. 2 Peter
3. 3 Sam

Dataset2
id child
1. 1 Bill
2. 2 Joe
3. 2 Mary
4. 3 Phil
5. 3 Sue
6. 3 Pat

I was thinking that even though -id- does not uniquely identify each observation in dataset 2, the datasets can still be merged using -id- as the match variable to obtain a result like the following:

id father child
1. 1 John Bill
2. 2 Peter Joe
3. 2 Peter Mary
4. 3 Sam Phil
5. 3 Sam Sue
6. 3 Sam Pat

Or is it that this kind of merge is not called match merge? Thanks.

Louis
[...]
That's exactly what I meant in my last message -- that the identifier uniquely identifies observations in one file but not the other. I do call this a match merge, and I believe that StataCorp does as well.
--David

David Kantor
Institute for Policy Studies
Johns Hopkins University
dkantor@jhu.edu
410-516-5404
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