Ajay Narottam Shah
2005-May-09 07:01 UTC
[R] Summary: My question about factor levels versus factor labels.
Yesterday, I had asked for help on the list. Brian Ripley and Bruno
Falissard had most kindly responded to me. Here is the solution.
> factorlabels <- c("School", "College",
"Beyond")
> # 1 2 3
> education.man <- c(1,2,1,2,1,2,1,2) # PROBLEM: Level "3"
doesn't occur.
> education.wife <- c(1,2,3,1,2,3,1,2)
> education.wife <- factor(education.wife, labels=factorlabels) # Is
fine.
> # But this breaks --
> # education.man <- factor(education.man, labels=factorlabels)
> # Solution --
> education.man <- factor(education.man, levels = c(1,2,3),
labels=factorlabels)
> # So now we can do --
> a <- rbind(table(education.wife), table(education.man))
> rownames(a) <- c("Wife", "Man")
> print(a)
School College Beyond
Wife 3 3 2
Man 4 4 0
which was the table that I had wanted.
--
Ajay Shah Consultant
ajayshah at mayin.org Department of Economic Affairs
http://www.mayin.org/ajayshah Ministry of Finance, New Delhi