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.
