plotellipse: Plot Ellipse
In StatDA: Statistical Analysis for Environmental Data

Description Usage Arguments Details Value Author(s) References Examples

Plots an ellipse with percentage tolerance and a certain location and covariance.

1	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))