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.

Usage

scatter(x, ...)
# S3 method for dudi
biplot(x, ...)
# S3 method for 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

Daniel Chessel
Stéphane Dray stephane.dray@univ-lyon1.fr

Examples

data(rpjdl)
rpjdl.coa <- dudi.coa(rpjdl$fau, scannf = FALSE, nf = 4)
screeplot(rpjdl.coa)
#> Error in eval(thecall$score, envir = sys.frame(sys.nframe() + pos)): object 'rpjdl.coa' not found
biplot(rpjdl.coa)
#> Error in biplot.dudi(rpjdl.coa): object 'rpjdl.coa' not found