You can use the clipplot function in the TeachingDemos package to limit the range of the line (the 2nd example in the help page shows an example of 3 lines for 3 subgroups of data with each line limited to the x-range of the data). There is also the clip function in the graphics package (no extra packages need to be installed), but it uses a different interface and getting it to work can be tricky sometimes.
Hope this helps, -- Gregory (Greg) L. Snow Ph.D. Statistical Data Center Intermountain Healthcare [EMAIL PROTECTED] (801) 408-8111 > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Tariq Perwez > Sent: Wednesday, June 18, 2008 8:09 PM > To: r-help@r-project.org > Subject: [R] Controlling the length of line with abline(lm()) > > Hi > I just realized that when I use linear regression to draw a > line through my data points with something like the following: > > abline(lm(y ~ x)) > > > the length of the line is infinite, i.e., the line goes > beyond the smallest and the largest data values. This seems > not very right to me (not to mention it looks unaesthetic). I > do not mean to imply that the straight-line behavior of my > system is maintained throughout. I would like to limit the > length of this line to the range of my data. However, I have > not been able to figure out how to. Very disconcertingly, I > found out that all the books that teach statistics using R > seem to be drawing such infinite length-lines. > I would appreciate any advice or suggestions. Regards, > > > Tariq > > [[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. > ______________________________________________ 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.
