Also take a look at qq.plot in the package "car". Gives you exactly what you want. Cheers Joris
On Fri, Jun 25, 2010 at 12:55 AM, Ralf B <ralf.bie...@gmail.com> wrote: > More details... > > I have two distributions which are very similar. I have plotted > density plots already from the two distributions. In addition, > I created a qqplot that show an almost straight line. What I want is a > line that represents the ideal case in which the two > distributions match perfectly. I would use this line to see how much > the errors divert at different stages of the plot. > > Ralf > > > > On Thu, Jun 24, 2010 at 5:56 PM, stephen sefick <ssef...@gmail.com> wrote: >> You are going to have to define the question a little better. Also, >> please provide a reproducible example. >> >> On Thu, Jun 24, 2010 at 4:44 PM, Ralf B <ralf.bie...@gmail.com> wrote: >>> I am a beginner in R, so please don't step on me if this is too >>> simple. I have two data sets datax and datay for which I created a >>> qqplot >>> >>> qqplot(datax,datay) >>> >>> but now I want a line that indicates the perfect match so that I can >>> see how much the plot diverts from the ideal. This ideal however is >>> not normal, so I think qqnorm and qqline cannot be applied. >>> >>> Perhaps you can help? >>> >>> Ralf >>> >>> ______________________________________________ >>> 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. >>> >> >> >> >> -- >> Stephen Sefick >> ____________________________________ >> | Auburn University | >> | Department of Biological Sciences | >> | 331 Funchess Hall | >> | Auburn, Alabama | >> | 36849 | >> |___________________________________| >> | sas0...@auburn.edu | >> | http://www.auburn.edu/~sas0025 | >> |___________________________________| >> >> Let's not spend our time and resources thinking about things that are >> so little or so large that all they really do for us is puff us up and >> make us feel like gods. We are mammals, and have not exhausted the >> annoying little problems of being mammals. >> >> -K. Mullis >> > > ______________________________________________ > 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. > -- Joris Meys Statistical consultant Ghent University Faculty of Bioscience Engineering Department of Applied mathematics, biometrics and process control tel : +32 9 264 59 87 joris.m...@ugent.be ------------------------------- Disclaimer : http://helpdesk.ugent.be/e-maildisclaimer.php ______________________________________________ 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.
