scatter function

Graphical representation of the outputs of a multivariate analysis

scatter is a generic function that has methods for the classes coa, dudi, fca, acm and pco. It plots the outputs of a multivariate analysis by representing simultaneously the rows and the colums of the original table (biplot). The function biplot returns exactly the same representation.

The function screeplot represents the amount of inertia (usually variance) associated to each dimension.

scatter(x, ...)
## S3 method for class 'dudi'
biplot(x, ...)
## S3 method for class 'dudi'
screeplot(x, npcs = length(x$eig), type = c("barplot", "lines"), 
    main = deparse(substitute(x)), col = c(rep("black", x$nf),
rep("grey", npcs - x$nf)), ...)

Arguments

• x: an object of the class dudi containing the outputs of a multivariate analysis
• npcs: the number of components to be plotted
• type: the type of plot
• main: the title of the plot
• col: a vector of colors
• ...: further arguments passed to or from other methods

See Also

s.arrow, s.chull, s.class, s.corcircle, s.distri, s.label, s.match, s.traject, s.value, add.scatter

Author(s)

Daniel Chessel

Stéphane Dray stephane.dray@univ-lyon1.fr

Examples

data(rpjdl)
rpjdl.coa <- dudi.coa(rpjdl$fau, scannf = FALSE, nf = 4)
screeplot(rpjdl.coa)
biplot(rpjdl.coa)