I was looking ?aggregate and ran the first example aggregate(state.x77, list(Region = state.region), mean)
The variables in state.x77 appear to be : > state.x77 Population Income Illiteracy Life Exp Murder HS Grad Frost Area Where is the "state.region" variable coming from? ______________________________________________ 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.
