SensoMineR (version 1.0)

plotellipse: Plot confidence ellipses

Description

Plot confidence ellipses.

Usage

plotellipse(mat, alpha = 0.05, coord = c(1,2),eig)

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

Examples

data(chocolates)
ktab.donnee <- ktab.data.frame(cbind.data.frame(chocolates[,1], 
    chocolates[,4], chocolates[,-(1:4)]), blocks = c(2,14), 
    tabnames = c("JP","Gr1"))
ktab.interesting.desc <- search.desc.ktab(ktab.donnee, level = 0.5)
axe <- construct.axes(ktab.interesting.desc, scale.unit = TRUE)
simul <- simulation(axe, nbbloc = length(ktab.interesting.desc$blo)-1)
plotellipse (simul, alpha = 0.05, eig = axe$eig)
#######################################
ktab.donnee <- ktab.data.frame(cbind.data.frame(chocolates[,1],
    chocolates[,4],chocolates[,-(1:4)]), blocks = c(2,6,4,4), 
    tabnames = c("JP","A","F","T"))
ktab.interesting.desc <- search.desc.ktab(ktab.donnee, level = 0.5)
axe <- construct.axes(ktab.interesting.desc, scale.unit = TRUE)
simul <- simulation(axe, nbbloc = length(ktab.interesting.desc$blo)-1)
plotellipse (simul, alpha = 0.05, eig = axe$eig)