To clarify, I'd like to create a column of indicators for the respective letters so that I could maybe do regression on indicators, etc.
For instance, "A" gets "1", "B" gets "2", and so on. On Aug 13, 2010, at 10:19 AM, David Winsemius wrote: On Aug 13, 2010, at 1:03 PM, TGS wrote: > # how would I code in R to look at the letter of the alphabet > # in the second column and create a indicator column for the > # corresponding letter? > > data(InsectSprays) > InsectSprays$spray It's already what most people mean when they say "indicator column", i.e., a factor variable (and not a character vector) .... so, what do _you_ mean? > -- David Winsemius, MD West Hartford, CT ______________________________________________ R-help@r-project.org 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.
