Hi Subhamitra, My apologies, I caught a mistake. To have the first tick in the middle of the first year, you want half of the _observations_ in a year, not half of the days. As I now have your data at my fingertips:
3567/15.58385 [1] 228.8908 Almost exactly what was calculated for the first series. Your increment remains 229 and your offset is 114, so year_mids<-seq(114,3567,229) Jim [[alternative HTML version deleted]] ______________________________________________ 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.