plotellipse function

Plot confidence ellipses

Plot confidence ellipses.

plotellipse(mat, alpha = 0.05, coord = c(1,2), eig, cex = 1, 
    color = NULL, title = NULL, graph.type = c("ggplot","classic"))

Arguments

• mat: Matrix with all the points
• alpha: the confidence level of the ellipses
• coord: a length 2 vector specifying the components to plot
• eig: a matrix with the component of the factor analysis (in row) and the eigenvalues, the inertia and the cumulative inertia for each component. Typically, the eig output of the construct.axes function
• cex: cf. function par in the graphics package
• color: a vector with the colors used; by default there are 35 colors defined
• title: string corresponding to the title of the graph you draw (by default NULL and a title is chosen)
• graph.type: a character that gives the type of graph used: "ggplot" or "classic"

Author(s)

Francois Husson

Examples

## Not run:

data(chocolates)
donnee <- cbind.data.frame(sensochoc[,c(1,4,5:18)])
axe <- construct.axes(donnee, scale.unit = TRUE)
simul <- simulation(axe)
plotellipse (simul, alpha = 0.05, eig = signif(axe$eig,4))
#######################################
donnee <- cbind.data.frame(sensochoc[,c(1,4,5:18)])
axe <- construct.axes(donnee, group = c(6,8), 
    name.group = c("A-F","T-S"),scale.unit = TRUE)
simul <- simulation(axe, nbgroup = (ncol(axe$partiel)-2)/(ncol(axe$moyen)-2))
plotellipse (simul, alpha = 0.05, eig = signif(axe$eig,4))
## End(Not run)