Here are answers to some common questions about ade4 (more to come soon).
ade4
?The easiest way to install ade4 is to use
install.packages("ade4")
in your R session.
ade4
?To install the development version from github:
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.
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
:
An alternative it to explicitly specify the package in the call using
the ::
operator:
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.
In simple analysis (e.g., dudi.pca
), scores for
individuals are stored in $li
element of the returned
object
In simple analysis (e.g., dudi.pca
), scores for
variables are stored in $co
element of the returned
object
$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).