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st: identifying observations where multiple conditions are met


From   Michael McCulloch <[email protected]>
To   [email protected]
Subject   st: identifying observations where multiple conditions are met
Date   Wed, 13 Nov 2013 12:14:13 -0800

Hello,
I have data of the structure:
	id 		(range 1 to 300)
	type 	(for each -id-, should equal only one of two values: 0 or 1).

In manual inspection of the data, I see instances exist where, for the same -id-, 
	some records have type==0, and  
	other records have type==1.

If I enter 
	. tab id if type==0 & type==1
obviously "no observations" is returned.

How would I write a command in which I can tabulate all -id- for which some observations exist where type==0, and others where type==1? (At data entry, -type- should have unique for each -id-.)


Best wishes,
Michael McCulloch

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