Probably easiest using the segments function. -- Gregory (Greg) L. Snow Ph.D. Statistical Data Center Intermountain Healthcare greg.s...@imail.org 801.408.8111
> -----Original Message----- > From: r-help-boun...@r-project.org [mailto:r-help-boun...@r- > project.org] On Behalf Of A Ezhil > Sent: Tuesday, May 11, 2010 12:45 PM > To: r-help@r-project.org > Subject: [R] Help with scatter plot > > 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. ______________________________________________ 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.
