Description Usage Arguments Details Value References See Also Examples

A generic function returning an ellipse or other outline of a confidence region for two parameters.

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`x` |
An object. In the default method the parameter |

`...` |
Descendant methods may require additional parameters. |

`scale` |
If |

`centre` |
The centre of the ellipse will be at this position. |

`level` |
The confidence level of a pairwise confidence region. The default is 0.95, for a 95% region. This is used to control the size of the ellipse being plotted. A vector of levels may be used. |

`t` |
The size of the ellipse may also be controlled by specifying the value of a t-statistic on its boundary. This defaults to the appropriate value for the confidence region. |

`which` |
This parameter selects which pair of variables from the matrix will be plotted. The default is the first 2. |

`npoints` |
The number of points used in the ellipse. Default is 100. |

The default method uses the
`(cos(theta + d/2), cos(theta - d/2))`

parametrization of an ellipse, where
`cos(d)`

is the correlation of the parameters.

An `npoints`

x `2`

matrix is returned with columns named according to the
row names of the matrix `x`

(default `'x'`

and `'y'`

), suitable
for plotting.

Murdoch, D.J. and Chow, E.D. (1996). A graphical display of large correlation matrices. The American Statistician 50, 178-180.

`ellipse.lm`

, `ellipse.nls`

,
`ellipse.profile`

, `ellipse.profile.nls`

,
`ellipse.arima0`

,
`plotcorr`

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