Hello, I'm glad you have a solution that works. Maybe you could do the same without hard-coding the values 1:7, 8:14.
$ library(chron) dat <- with(my_dataframe, paste(month, day, year, sep="/")) week <- cut(chron(dat), breaks="weeks") head(week) tapply(my_dataframe$Freq, week, mean) Hope this helps, Rui Barradas -- View this message in context: http://r.789695.n4.nabble.com/Summary-about-how-to-divide-data-by-week-tp4563909p4565199.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org 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.