Thanks every one first. I have a dataset like this
Year Month Day Hour DIR SPD (m/s) SKYCOVER TEMP (C) RH(%) 2009 1 1 0 310 13.85824 3 -5 23 2009 1 1 1 330 14.30528 3 -7.222222222 26 2009 1 1 2 320 10.72896 3 -7.222222222 24 2009 1 1 3 320 10.72896 3 -6.666666667 23 2009 1 1 4 320 10.28192 3 -7.222222222 26 2009 1 1 5 330 10.28192 3 -7.222222222 26 2009 1 1 6 330 10.28192 3 -7.222222222 25 2009 1 1 6 320 12.96416 3 -7.222222222 26 2009 1 1 7 330 11.176 3 -7.222222222 26 2009 1 1 8 330 10.72896 3 -7.777777778 28 2009 1 1 9 330 10.72896 3 -7.777777778 27 2009 1 1 9 320 11.176 3 -7.222222222 26 2009 1 1 10 320 12.51712 3 -7.777777778 24 2009 1 1 11 310 9.83488 3 -7.777777778 24 2009 1 1 12 310 9.83488 3 -8.333333333 25 2009 1 1 12 310 10.72896 3 -8.888888889 26 2009 1 1 13 320 9.83488 3 -7.777777778 26 2009 1 1 14 310 9.83488 3 -7.222222222 23 2009 1 1 15 310 9.83488 3 -7.222222222 23 2009 1 1 15 320 10.72896 0 -7.222222222 23 2009 1 1 16 320 8.04672 0 -6.111111111 21 2009 1 1 17 300 9.83488 0 -3.888888889 18 2009 1 1 18 300 9.83488 0 -4.444444444 19 2009 1 1 18 310 9.38784 0 -2.777777778 16 2009 1 1 19 320 7.59968 3 -2.777777778 16 2009 1 1 20 310 6.25856 3 -2.777777778 18 2009 1 1 21 310 6.25856 3 -2.777777778 18 2009 1 1 21 310 7.15264 3 -2.777777778 16 2009 1 1 22 310 7.59968 3 -2.777777778 16 2009 1 1 23 300 5.81152 3 -3.888888889 16 It is a one year (2009), 12 month, every day, every hour data. Notice that there are sometimes several readings within one hour. I want to calculate the hourly avg for each day in each month. Anyone could help me on this. -- View this message in context: http://r.789695.n4.nabble.com/Please-help-me-on-a-simple-avg-question-tp3045440p3045440.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.
