Dear all,
I am a new R user, and I have a question about R macro.
Here is the situation, I want to do item option analysis (options include: A
, B, C, D), below is the codes for option A analyses.
#option A analyses
optiona<-mat.or.vec(nrow(responsedata2), ncol(responsedata2))
# create A matrix by recoding
for (i in 1:ncol(responsedata2)){
optiona[,i]<-recode(responsedata2[,i],"'A'=1;NA=NA;else=0")
}
# compute mean for A matrix
pa<-rep(0,ncol(optiona))
for (i in 1:ncol(optiona)){
pa[i]<-round(mean(optiona[,i],na.rm=TRUE),2)
}
pa1<-as.data.frame(pa)
I can repeat the codes for other options such as "B", "C" and
"D", but I am wondering if I can do it
in a macro way--subsituting "A" "a" in the codes with "B" "b", etc.
In SAS it can be done easily, but I could not get it to work in R.
Waiting for your reply.
And thank you so much in advance.
Meng
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