StatDA (version 1.7.11)

plotellipse: Plot Ellipse

Description

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

Usage

plotellipse(x.loc, x.cov, perc = 0.98, col = NULL, lty = NULL)

Value

Plot with ellipse.

Arguments

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

Author

Peter Filzmoser <> http://cstat.tuwien.ac.at/filz/

Details

First the radius of the covariance is calculated and then the ellipses for the provided percentages are plotted at the certain location.

References

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.

Examples

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))