Greetings,
I'm learning R and I'm stuck on a basic concept: how to specify a
logical condition once and then perform multiple transformations under
that condition. The program below is simplified to demonstrate the goal.
Its results are exactly what I want, but I would like to check the
logical state of gender only once and create both (or any number of)
scores at once.
mystring<-
("id,group,gender,q1,q2,q3,q4
01,1,f,2,2,5,4
02,2,f,2,1,4,5
03,1,f,2,2,4,4
04,2,f,1,1,5,5
05,1,m,4,5,4,
06,2,m,5,4,5,5
07,1,m,3,3,4,5
08,2,m,5,5,5,4")
mydata<-read.table(textConnection(mystring),header=TRUE,sep=",",row.name
s="id")
mydata
#Create score1 so that it differs for males and females:
mydata$score1 <- ifelse( mydata$gender=="f" ,
(mydata$score1 <- (2*mydata$q1)+mydata$q2),
ifelse( mydata$gender=="m",
(mydata$score1 <- (3*mydata$q1)+mydata$q2), NA )
)
mydata
#Create score2 so that it too differs for males and females:
mydata$score2 <- ifelse( mydata$gender=="f" ,
(mydata$score2 <- (2.5*mydata$q1)+mydata$q2),
ifelse( mydata$gender=="m",
(mydata$score2 <- (3.5*mydata$q1)+mydata$q2), NA )
)
mydata
Thanks!
Bob
=========================================================
Bob Muenchen (pronounced Min'-chen), Manager
Statistical Consulting Center
U of TN Office of Information Technology
200 Stokely Management Center, Knoxville, TN 37996-0520
Voice: (865) 974-5230
FAX: (865) 974-4810
Email: [EMAIL PROTECTED]
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