SUM,COUNT,AVG
A good package for this sort of questions is doBy, too. library(doBy) summaryBy( tpdv + UM + qta ~ Materiale ,data=data,FUN=c(sum,length,mean)) regards, Christian
Hi, I ve been searching a lot in internet..but I can t find a solution Attached, you find a file. I need for each (Materiale, tpdv, UM) to find sum,avg and count My idea was to aggregate for the 3 parameters ..but I don t know how to get the numeric value (SUM,COUNT,AVG) I need. Can you help me? thank you http://www.nabble.com/file/p22905322/ordini2008_ex.txt ordini2008_ex.txt