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st: Classifying Subjects


From   Raphael Fraser <raphael.fraser@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: Classifying Subjects
Date   Tue, 18 Oct 2005 11:55:14 -0500

Dear ALL,

I have a longitudinal data set that contains nearly 500 patients. All
patients were tested at these times dot (date of test) for the level
of protein in the blood; the result being 0 (no protein) T (trace
amounts of protein), 1, 2, 3 or 4. I would like to classify these
subjects based on the criteria below:

"Minimal" if protein is T on at least 2 out of 3 consecutive years.
"Sustained" if the result is minimal and lasts 3 years or more.
"Heavy" if sustained with protein  2 or greater lasting 3 years or more.

id		dot       protein	
31	15mar1985	T	
31	14mar1986	0	
31	15mar1989	T	
31	15mar1990	T	
31	15mar1991	T	
31	15mar1993	0	
31	18feb1994	 T	
31	07jun1995	 0	
31	23aug1996	1	
31	10may1999      T	

Can anyone help?

Thanks in advance

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