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
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