Dear Ted, You are correct in that factors are probably what I had in mind since I would be using them as predictors in a regression. I didn't know the syntax to get R to do the arithmetic.
Many thanks to everyone who replied! Sincerely, KeithC. Psych Undergrad, CU Boulder (US) RE McNair Scholar ______________________________________________ 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.
