These functions plot ellipses (or ellipsoids in 3D) in canonical discriminant space representing the hypothesis and error sums-of-squares-and-products matrices for terms in a multivariate linear model. They provide a low-rank 2D (or 3D) view of the effects for that term in the space of maximum discrimination.
# S3 method for candiscList
heplot(mod, term, ask = interactive(), graphics = TRUE, ...)# S3 method for candiscList
heplot3d(mod, term, ask = interactive(), graphics = TRUE, ...)
A candiscList object for terms in a mlm
The name of one term to be plotted for the heplot and
heplot3d methods. If not specified, one
plot is produced for each term in the mlm object.
If TRUE (the default), a menu of terms is presented; if ask is FALSE,
canonical HE plots for all terms are produced.
if TRUE (the default, when running interactively), then the menu of terms to plot is presented in a dialog box rather than as a text menu.
Arguments to be passed down
No useful value; used for the side-effect of producing canonical HE plots.
Friendly, M. (2006). Data Ellipses, HE Plots and Reduced-Rank Displays for Multivariate Linear Models: SAS Software and Examples Journal of Statistical Software, 17(6), 1-42. http://www.jstatsoft.org/v17/i06/
Friendly, M. (2007). HE plots for Multivariate General Linear Models. Journal of Computational and Graphical Statistics, 16(2) 421--444. http://datavis.ca/papers/jcgs-heplots.pdf