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st: Classifying Subjects
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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