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st: RE: Tabulating data with multiple visits--simple question


From   Nick Cox <[email protected]>
To   "'[email protected]'" <[email protected]>
Subject   st: RE: Tabulating data with multiple visits--simple question
Date   Fri, 4 Mar 2011 19:51:57 +0000

This doesn't look simple at all to me in so far as your data example is unclear to me in my mailer, at the StataCorp version of the archives, and at the HSPH version too. 

Perhaps someone else can figure it out. If not, please post again with clear structure to data example. 

Nick 
[email protected] 

Tasha Amin

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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