Plot Ellipse
Plots an ellipse with percentage tolerance and a certain location and covariance.
plotellipse(x.loc, x.cov, perc = 0.98, col = NULL, lty = NULL)
x.loc |
the location vector |
x.cov |
the covariance |
perc |
defines the percentage and should be a (vector of) number(s) between 0 and 1 |
col, lty |
graphical parameters |
First the radius of the covariance is calculated and then the ellipses for the provided percentages are plotted at the certain location.
Plot with ellipse.
Peter Filzmoser <P.Filzmoser@tuwien.ac.at> http://cstat.tuwien.ac.at/filz/
C. Reimann, P. Filzmoser, R.G. Garrett, and R. Dutter: Statistical Data Analysis Explained. Applied Environmental Statistics with R. John Wiley and Sons, Chichester, 2008.
data(moss) Ba=log10(moss[,"Ba"]) Ca=log10(moss[,"Ca"]) plot.new() plot.window(xlim=range(Ba),ylim=c(min(Ca)-1,max(Ca))) x=cbind(Ba,Ca) plotellipse(apply(x,2,mean),cov(x),perc=c(0.5,0.75,0.9,0.98))
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