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Re: st: Counting unique strings

From   Gary Longton <>
Subject   Re: st: Counting unique strings
Date   Wed, 25 Feb 2004 14:54:22 -0800

Paul O'Brien wrote:

I have a database of 40,000 clinic visits, with multiple visits by each patient (patient_id). How do I count the number of patients seen?
-distinct- on SSC (-ssc describe distinct-) provides one easy solution.

or see the FAQ: "How do I compute the number of distinct observations" at

- Gary

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