Hi all, Suppose I have a vector x with numerical values. In y, I have a categorial variable : y<-c(1,1,..2,2,...30,30,30) x and y have the same length. I would like to compute the mean for x for the modality 1 to 30 in y. mean(x[y==1]),...,mean(x[y==30]) I do not want to use an iterative procedure such that for (i in 1:30).. Thanks for your help,
Regards. Olivier. -- ------------------------------------------------------------- Martin Olivier INRA - Unité Biostatistique & Processus Spatiaux Domaine St Paul, Site Agroparc 84914 Avignon Cedex 9, France Tel : 04 32 72 21 57 ______________________________________________ [email protected] 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.
