Farrel Buchinsky wrote: > It is easy to index on numeric variables. > How does one index on a variable that is a factor? >
Same as for numeric objects. Example: R> x <- factor(c("A", "B")) R> x [1] A B Levels: A B R> x[1] [1] A Levels: A B ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.