I have a measurement that was taken in 15 minutes or more and want to aggregate it by hour. How could I do that?
Sample data is found below date_time concentration 26/11/2013 15:46 529.25 26/11/2013 16:03 1596 26/11/2013 16:23 1027.111 26/11/2013 16:39 1001.9 26/11/2013 16:54 -80.25 26/11/2013 17:12 1064.125 26/11/2013 11:14 7969.7 26/11/2013 11:32 522 26/11/2013 11:58 845.111 26/11/2013 12:12 1166.875 26/11/2013 12:30 473.375 26/11/2013 12:42 466.2 26/11/2013 07:47 4358.833 26/11/2013 08:05 1257.545 26/11/2013 08:24 828.6 26/11/2013 08:45 942 26/11/2013 08:58 758.111 26/11/2013 09:13 832.333 26/11/2013 15:45 1876.909 26/11/2013 16:07 574.25 26/11/2013 16:27 1736.846 26/11/2013 16:43 1024.857 26/11/2013 16:59 858.538 26/11/2013 17:15 912.455 26/11/2013 11:18 2086.143 26/11/2013 11:39 2078.667 26/11/2013 12:03 1619.072 26/11/2013 12:16 1197.583 26/11/2013 12:35 619.308 26/11/2013 12:51 1222.571 26/11/2013 07:49 1357.929 26/11/2013 08:08 1120 26/11/2013 08:29 1381.6 26/11/2013 08:48 1493.429 26/11/2013 09:03 1113.786 26/11/2013 09:18 1217.143 ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.