Dear Stefano,
A practical way might be as the following
R> acc<-read.table("acc.txt",header=T) #reading your data into R
R> acc.may<-acc[acc[,3]==5,] #subsetting data with respect to may
R> acc.may.order<-acc.may[order(acc.may[,4]),] #ordering with respect to day
R> mean(acc.may.order[1:7,5]) # mean of the period of day 1 to 7
R> mean(acc.may.order[8:14,5]) # mean of the period of day 8 to 15
This script is just for May and taking means needs manual manipulations. On
the other hand, simple loops might deal with your problem such as for loop.
Best
Ozgur
-----
************************************
Ozgur ASAR
Research Assistant
Middle East Technical University
Department of Statistics
06531, Ankara Turkey
Ph: 90-312-2105309
http://www.stat.metu.edu.tr/people/assistants/ozgur/
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