Here are answers to some common questions about **ade4**
(more to come soon).

## Installation

### 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")`

## Graphics

### 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`

:

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

operator:

`adegraphics::s.label()`

## Simple Analysis

### 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).