FAQ

How to install the current version of ade4?

The easiest way to install ade4 is to use install.packages("ade4") in your R session.

How to install the development version of ade4?

To install the development version from github:

remotes::install_github("adeverse/ade4")

How do I know which ade4 version I’m using?

In your R session, type:

packageDescription("ade4", field="Version")

What is adegraphics?

The package adegraphics provides a complete reimplementation of graphical functionalities of ade4. It is based on lattice and provides a convenient way to manage graphics as objects. Moreover, it offers much more flexibility than ade4 to customize your plots.

How to load adegraphics?

As adegraphics provides a reimplementation of ade4 graphical functions, many functions have the same name in the two packages. To be sure to use adegraphics functions, adegraphics should be loaded after ade4:

library(ade4)
library(adegraphics)

An alternative it to explicitly specify the package in the call using the :: operator:

adegraphics::s.label()

How to interpret ellipses plotted by s.class function?

The ellipses represent the main variation for individuals of a given class. They are based on inertia statistics not on significance levels.

How to obtain coordinates for individuals?

In simple analysis (e.g., dudi.pca), scores for individuals are stored in $li element of the returned object

How to obtain coordinates for variables?

In simple analysis (e.g., dudi.pca), scores for variables are stored in $co element of the returned object

What are the $l1 and $c1 elements of a dudi ?

In simple analysis (e.g., dudi.pca), the $c1 element contains the principal axes (aka “loadings” of the variables) and the $l1 element contains the principal components. The norm of these two elements is equal to 1, which makes them useful for drawing biplots (for example).