Description

This package contains various routines for drawing ellipses and ellipse-like confidence regions, implementing the plots described in Murdoch and Chow (1996).

There are also routines implementing the profile plots described in Bates and Watts (1988).

Details

There are three groups of routines in the ellipse package. The first consists of those involved with plotcorr, which implements the plots described in Murdoch and Chow (1996). These display correlations using ellipses, whose shape is that of the contours of a bivariate normal distribution with matching correlation.

The second group implements a version of the profile plots described in Bates and Watts (1988); see ellipse.profile and pairs.profile.

The last group provide the basis for the others, drawing ellipses based on various S objects, including scalar correlations, covariance matrices arima, lm, and nls fits: see ellipse.

Author(s)

Duncan Murdoch <murdoch@stats.uwo.ca> and E. D. Chow (porting to R by Jesus M. Frias Celayeta <iosu@bureau.ucc.ie>)

Maintainer: Duncan Murdoch <murdoch@stats.uwo.ca>

References

Bates, D.M. and Watts, D.G. (1988). Nonlinear Regression Analysis and its Applications. Wiley.

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