Dear John, Thanks, this actually works just fine! much easier than the ellipse-package!
Lukas On Monday, June 6, 2011, John Fox <j...@mcmaster.ca> wrote: > Dear Lukas, > > You might try the dataEllipse() function in the car package. > > I hope this helps, > John > >> -----Original Message----- >> From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] >> On Behalf Of Lukas Baitsch >> Sent: June-06-11 10:33 AM >> To: r-help@r-project.org >> Subject: [R] adding an ellipse to a PCA plot >> >> Hi, >> >> I created a principal component plot using the first two principal >> components. I used the function princomp() to calculate the scores. >> now, I would like to superimpose an ellipse representing the center and >> the 95% confidence interval of a series of points in my plot (as to >> illustrate the grouping of my samples). >> >> I looked at the ellipse() function in the ellipse package but can't get >> it to work. the princomp()-function gives me the scores of each point, >> so I can calculate the mean and the 95%-CI, but I can't integrate this >> into the ellipse()-function). Is there a better way of doing this or can >> someone help me figure out this function? >> >> best regards, >> >> Lukas >> >> ______________________________________________ >> 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.
