I am afraid the above example will not work. In original dataset of Jabez Wilson numerical range is from 0..7.
So try this one: df<-as.factor(c("0","I","II","III","IV","V","VI","VII")[df$area+1]) Hope this is what you want, Rainer Henrique Dallazuanna schrieb: > Hi, > > df > ht area > 1 320 3 > 2 410 4 > 3 230 2 > 4 360 3 > 5 126 1 > 6 280 2 > 7 260 2 > 8 280 2 > 9 280 2 > 10 260 2 > > df$area <- as.factor(df$area) > levels(df$area) <- c("I", "II", "III", "IV") > > > On 10/08/07, Jabez Wilson <[EMAIL PROTECTED]> wrote: >> Dear R Help, >> I have a set of data of heights of trees described by area that they >> are in. The areas are numerical (0 to 7). >> >> ht area >> 1 320 3 >> 2 410 4 >> 3 230 2 >> 4 360 3 >> 5 126 1 >> 6 280 2 >> 7 260 2 >> 8 280 2 >> 9 280 2 >> 10 260 2 >> ....... >> 180 450 4 >> 181 90 1 >> 182 120 1 >> 183 440 4 >> 184 210 2 >> 185 330 3 >> 186 210 2 >> 187 100 1 >> 188 0 0 >> >> I want to convert the area column values to factors, to do an anova. >> However, if I use: >> >> df$areaf <- factor(df$area, >> labels=c("0","I","II","III","IV","V","VI","VII")) >> >> it gives the following message: >> >> Error in factor(df$area, labels = c("0", "I", "II", "III", "IV", "V", >> "VI", : >> invalid labels; length 8 should be 1 or 7 >> >> Can anyone help? >> >> Jabez ______________________________________________ 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.