Hi,
You can also use:
?do.call(rbind,lapply(split(dat1,dat1$ID),function(x) head(x[x$COMPL!=0,],1)))
#? ID COMPL SEX HEREDITY
#1? 1???? 3?? 1??????? 2
#2? 2???? 1?? 0??????? 1
#3? 3???? 2?? 0??????? 1
----- Original Message -----
From: Tasnuva Tabassum <t.tasnuva at gmail.com>
To: r-help at r-project.org
Cc:
Sent: Saturday, February 23, 2013 9:28 AM
Subject: [R] Selecting First Incidence from Longitudinal Data
I have a longitudinal competing risk data of the form:
ID? ? COMPL? SEX? HEREDITY
1? ? 0? ? ? 1? ? ? 2
1? ? 0? ? ? 1? ? ? 2
1? ? 3? ? ? 1? ? ? 2
2? ? 0? ? ? 0? ? ? 1
2? ? 1? ? ? 0? ? ? 1
2? ? 2? ? ? 0? ? ? 1
2? ? 2? ? ? 0? ? ? 1
3? ? 0? ? ? 0? ? ? 1
3? ? 0? ? ? 0? ? ? 1
3? ? 0? ? ? 0? ? ? 1
3? ? 0? ? ? 0? ? ? 1
3? ? 2? ? ? 0? ? ? 1
4? ? 0? ? ? 1? ? ? 2
4? ? 0? ? ? 1? ? ? 2.
Where, COMPL= health complication of diabetic patients which has value
labels? as? 0= no complication,1=coronary heart disease, 2=retinopathy, 3=
nephropathy.
I want to select only the first complication that occurred to each patient.
What R function can I use?
??? [[alternative HTML version deleted]]
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