Try this: factor(pH,levels=names(sort(tapply(Riqueza,pH,mean)))) 2008/2/20, Ronaldo Reis Junior <[EMAIL PROTECTED]>: > 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. >
-- Henrique Dallazuanna Curitiba-Paraná-Brasil 25° 25' 40" S 49° 16' 22" O ______________________________________________ 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.
