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st: Need help converting values into factor variable
From
Michael Stewart <[email protected]>
To
[email protected]
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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