How to install the current version ofade4?

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

How to install the development version ofade4?

To install the development version from github:

remotes::install_github("adeverse/ade4")

How do I know whichade4 version I’m using?

In your R session, type:

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

What isadegraphics?

The packageadegraphics provides a complete reimplementation of graphical functionalities ofade4. It is based onlattice and provides a convenient way to manage graphics as objects. Moreover, it offers much more flexibility thanade4 to customize your plots.

How to loadadegraphics?

Asadegraphics provides a reimplementation ofade4 graphical functions, many functions have the same name in the two packages. To be sure to useadegraphics functions,adegraphics should be loadedafterade4:

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 bys.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).