Rolf Turner wrote: > P.S. ***Are*** there any risks/dangers in following Christos > Hatzis' suggestion of simply doing > > levels(fff) <- c("U","A","S") ??? Not if the levels are right to begin with.
Problems only arise if fff somehow becomes a two-level factor, e.g. if you do fff <- fff[2:3, drop=TRUE]. Then you can get this effect: > fff [1] Unit Scholarship Scholarship Unit Levels: Scholarship Unit > fff[2:3, drop=TRUE] [1] Scholarship Scholarship Levels: Scholarship > fff[-(2:3), drop=TRUE] [1] Unit Unit Levels: Unit > ggg <- fff[2:3, drop=TRUE] > levels(ggg) <- c("a","b") > ggg [1] a a Levels: a b > ggg <- fff[-(2:3), drop=TRUE] > levels(ggg) <- c("a","b") > ggg [1] a a Levels: a b -- O__ ---- Peter Dalgaard Ă˜ster Farimagsgade 5, Entr.B c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907 ______________________________________________ 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.