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st: Requirement(s) for a match merge

From	"louis boakye-yiadom" <[email protected]>
To	[email protected]
Subject	st: Requirement(s) for a match merge
Date	Wed, 30 Mar 2005 16:07:00 +0000

Dear All,
Is it true that "for a match merge to work, the identifier or identifiers must uniquely identify each observation"? I found this statement in sample lecture NC 101 (one of StataCorp's NetCourses), but I thought that this requirement (of the id uniquely identifying each observation) is often desirable, but not necessary in all cases. Any insights will be appreciated. Thank you.

Louis

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