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


From   "louis boakye-yiadom" <louisby@hotmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   RE: st: RE: Requirement(s) for a match merge
Date   Wed, 30 Mar 2005 17:55:12 +0000

Thank you, Nick.


From: "Nick Cox" <n.j.cox@durham.ac.uk>

I see what you are getting at.

-father- is irrelevant to the -merge-. You
can merge on -id- without problems with this
example.

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

louis boakye-yiadom

> 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.

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