a data set like this: year month day count 2001 1 1 10 2001 1 2 11 .... 2004 7 17 8 ....
basically it is a count of of some numbers everyday through a few years now I'd like to get the mean of the count for every day. I thought I can do this using for and ifelse, but is there a simple way to do this? I wish a function like mean(count, 'only when year, month, day are equal') could do this. thank you. ______________________________________________ [EMAIL PROTECTED] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
