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st: Need help converting values into factor variable


From   Michael Stewart <michaelstewartresearch@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: Need help converting values into factor variable
Date   Sat, 1 Dec 2012 06:55:18 -0500

Dear Statlist reader ,
I am having trouble converting  my values into factor variables and am
looking for help. My data looks as follows where "patientid" is pt
identification number and "year_elevated" is year in which a
particular lab value was elevated


patientid	year_elevated	
111		2009
111		2009
222		2009
222		2011
222		2012
333		2009
333		2012
444		2011
444		2012
555		2009
555		2010
555		2011
555		2012

I want to create a factor variable (y  )with values 1= ,2 , 3 and 4
where  for each distinct patientid
y=1 if year_elevated  has anyone of ( 2009 or 2010 or 2011 or 2012)  values
y=2 if year_elevated  has  any two of ( 2009 , 2010 , 2011 ,  2012)  values
y=3 if year_elevated has  any three of ( 2009 , 2010 , 2011 ,  2012)  values
y=4 if year_elevated  has  all four of ( 2009 , 2010 , 2011 ,  2012) values

-- 
Thank you ,
Yours Sincerely,
Mike.
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