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 0.2-8
Index]