[R] how to divide data by week

Özgür Asar oasar at metu.edu.tr
Sat Apr 14 07:58:17 CEST 2012

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.


Ozgur ASAR

Research Assistant
Middle East Technical University
Department of Statistics
06531, Ankara Turkey
Ph: 90-312-2105309
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