plotellipse {StatDA} | 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>

### References

C. Reimann, P. Filzmoser, R.G. Garrett, and R. Dutter: Statistical Data Analysis Explained. Applied Environmental Statistics with R. John Wiley and Sons Inc. To appear.

### 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))

[Package StatDA version 1.0 Index]