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

plotellipse

R Documentation

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)

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

Details

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

Value

Plot with ellipse.

Author(s)

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

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))

StatDA documentation built on June 7, 2023, 6:26 p.m.