Hello, This maybe a newbie question. I have a dataframe that looks like the sample at the bottom of the email. I have monthly precipitation data from several sites over several years. For each site, I need to extract years that have a complete series of 12 monthly precipitation values, while excluding that year for sites with incomplete data. I can't figure out how to do this gracefully (i.e. without a silly for loop). Any help will be appreciate, thanks!
Andrew SiteID year month precip(mm) 670090 1941 jan 2998 670090 1941 feb 1299 670090 1941 mar 1007 670090 1941 apr 354 670090 1941 may 88 670090 1941 jun 156 670090 1941 jul 8 670090 1941 aug 4 670090 1941 sep 8 670090 1941 oct 58 670090 1941 nov 397 670090 1941 dec 248 670090 1942 jan NA 670090 1942 feb 380 670090 1942 mar 797 670090 1942 apr 142 670090 1942 may 43 670090 1942 jun 14 670090 1942 jul 70 670090 1942 aug 51 670090 1942 sep 0 670090 1942 oct 10 670090 1942 nov 235 670090 1942 dec 405 -- Andrew [[alternative HTML version deleted]] ______________________________________________ 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.