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st: RE: counting unique ids


From   "FEdMerchant" <fedmerchant@comcast.net>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: counting unique ids
Date   Tue, 7 Sep 2004 18:54:24 -0700

-findit count unique- points to the following FAQ: How do I compute the
number of distinct observations? Do you have an additional requirement
that's not covered in the FAQ?

..Frank

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Kang, Eugene
Sent: Tuesday, September 07, 2004 6:48 PM
To: 'statalist@hsphsun2.harvard.edu'
Subject: st: counting unique ids

Hi,

I have a cross-section panel data that is unbalanced. For instance:
id	year		x1
111	1999		3
111	2000		5
111	2001		6
123	2000		4
123	2001		2

For the above example, there are 2 unique ids (111 and 123). Since my
dataset has over 6000 observations, what commands should I use to
generate a
count of unique ids?

Any help would be appreciated. Thanks!

SoonLee
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