Dear All, I would like to add the mean line in the scatter plot by groups. I have plotted (X.val is 3 groups: 0, 1, 2): plot( Y ~ X.val). How can I add mean/median line (horizontal) for each group on the scatter plot?
Thanks in advance. Kind regards, Ezhil ______________________________________________ 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.
