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st: Tabulating data with multiple visits--simple question


From   Tasha Amin <[email protected]>
To   <[email protected]>
Subject   st: Tabulating data with multiple visits--simple question
Date   Fri, 4 Mar 2011 14:32:58 -0500

Sorry for how simple this is. Having too many problems with it so far.
I have data with multiple visits by the same person and would like to summarize results by counting their id's only once. How do I tabulate it? Data looks like
ID visits clear1    1     01    2     0   1    3     11    4     11    5     12    1     02    2     13    1     0 4    1     04    2     1
When tabulating, I would like the frequency of "clear" to be 3 (corresponding to ID's 1,2, and 4) NOT 5, based on visits. Please help. Thanks! 		 	   		  
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