| tolellipse {rrcov} | R Documentation |
Tolerance Ellipse Plot
Description
Plots the 0.975 tolerance ellipse of the bivariate data set x.
The ellipse is defined by those data points whose distance
is equal to the squareroot of the 0.975 chisquare quantile
with 2 degrees of freedom.
Usage
tolellipse(x, mcd, cutoff, id.n, classic = FALSE, tol=1e-7)
Arguments
x |
a two dimensional matrix or data frame. |
mcd |
An object of type mcd - its attributes center and cov will be used. If missing the MCD will be computed. |
cutoff |
Distance needed to flag data points outside the ellipse |
id.n |
Number of observations to identify by a label. If not supplied, the number of observations with distance larger than cutoff is used. |
classic |
Whether to plot the classical distances too. Default is classic=FALSE. |
tol |
Tolerance to be used for computing the inverse see 'solve'. Default is tol = 10e-7 |
See Also
tolellipse
Examples
data(hbk)
mcd <- covMcd(hbk.x) # compute mcd in advance
tolellipse(hbk.x[,1:2]) # must be a 2-dimensional data set: take the first two columns
[Package
rrcov version 0.2-7
Index]