Hi, How to order the levels os factor not by alphabetic order but by mean of Y. Somethink like this:
I have this alphabetic order: > levels(pH) [1] "alto" "baixo" "medio" the order by mean os yvar is: > sort(tapply(Riqueza,pH,mean)) baixo medio alto 11.56667 20.00000 26.80000 How to make the levels of pH ordered by this mean to the result to see somethink like this: > levels(pH) [1] "baixo" "medio" "alto" I try this to make a function that I need to get ordered levels by this mean and after rename to make a automatic contrasts by comparing models. > levels(pH)[1] <- "baixomedio" > levels(pH)[2] <- "baixomedio" > levels(pH) [1] "baixomedio" "alto" and after this a make a new model to be compared with a model with 3 levels where "baixo" and "medio" is separated. without ordered levels these command is wrong because the levels(pH)[1] is "alto" and not "baixo". Normally I use recode from car package, but for automatization your syntax is a difficult. Thanks Ronaldo -- > Prof. Ronaldo Reis Júnior | .''`. UNIMONTES/Depto. Biologia Geral/Lab. de Biologia Computacional | : :' : Campus Universitário Prof. Darcy Ribeiro, Vila Mauricéia | `. `'` CP: 126, CEP: 39401-089, Montes Claros - MG - Brasil | `- Fone: (38) 3229-8187 | [EMAIL PROTECTED] | [EMAIL PROTECTED] | http://www.ppgcb.unimontes.br/ | ICQ#: 5692561 | LinuxUser#: 205366 ______________________________________________ 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.
