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st: BASIC QUESTION - counts of counts


From   "Ben Hoen" <bhoen@lbl.gov>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: BASIC QUESTION - counts of counts
Date   Fri, 22 Jul 2011 14:59:12 -0400

Can someone help me to produce a table that counts the number of unique
occurrences of a group inside another group?

For example assume I had the following table:

Number 	State	County
1		NY	Madison
2		NY	Madison
3		PA	Somerset
4		NY	Oneida		
5		PA	Somerset
6		PA	Wayne
7		PA	Luzerne

I want to produce a table like this:
State	County
NY	2
PA	3

Any ideas?

Ben

Ben Hoen
Principal Research Associate
Lawrence Berkeley National Laboratory
Office: 845-758-1896
Cell: 718-812-7589
bhoen@lbl.gov
http://eetd.lbl.gov/ea/emp/staff/hoen.html



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