Dear Jana, The lty argument to dataEllipse() (in the car package) isn't vectorized. It could be, and I'll add that as a feature request. Actually, lty isn't an explicit argument to dataEllipse(); it's simply passed through to the lines() function, which draws the ellipses.
You should be able to do what you want by adding the ellipses one at a time to your plot (see the argument add in ?dataEllipse) or by using the coordinates of the ellipses, returned by dataEllipse(), to a customized graph. I hope that this helps, John ------------------------------------------------ John Fox Sen. William McMaster Prof. of Social Statistics Department of Sociology McMaster University Hamilton, Ontario, Canada http://socserv.mcmaster.ca/jfox/ On Thu, 25 Apr 2013 20:00:20 -0400 Jana Makedonska <jmakedon...@gmail.com> wrote: > Hi Everyone, > > I am working with the R function "dataEllipse". I plot the 95% confidence > ellipses for several different samples in the same plot and I color-code > the ellipse of each sample, but I do not know how to specify a different > line pattern for each ellipse. I can only modify the pattern for all > ellipses with the "lty" argument. Any help will be highly appreciated. > > Thanks in advance! > Jana > > -- > > > Jana Makedonska, > B.Sc. Biology, Universite Paul Sabatier Toulouse III > M.Sc. Paleontology, Paleobiology and Phylogeny, Universite de Montpellier II > Ph.D. candidate in Physical Anthropology and Part-time lecturer > Department of Anthropology > College of Arts & Sciences > State University of New York at Albany > 1400 Washington Avenue > 12222 Albany, NY > Office phone: 518-442-4699 > http://electricsongs.academia.edu/JanaMakedonska > > [[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.