Re: [R-br] aggregate

Não complique o fácil!! da=data.frame(A=rep(LETTERS[1:3],3), B=rep(letters[1:3],3), y=rnorm(9), x=rnorm(9), z=rnorm(9)) aggregate(da[,-c(1:2)], list(A=da[['A']], B=da[['B']]), function(x) c('Média'=mean(x), 'Desvio'=sd(x), 'CV'=sd(x)/mean(x)*100)) (S,f,P) Allaman