Hi, I have dataset n1 and v1 (years). when i ask median(year) [1] NA
but if i put summary of dataset n1: summary(n1) R produces median (together with min/max/mean....) why it is so? -- ************************** Vlatka Matkovic Puljic 095/8618 171 [[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.