## Dray S., Dufour A.B. (2007).
*The ade4 package: implementing the duality diagram for
ecologists*.
Journal of Statistical Software, 22(4):1--20.

Multivariate analyses are well known and widely used to
identify and understand structures of ecological
communities. The ade4 package for the R statistical
environment proposes a great number of multivariate
methods. Its implementation follows the tradition of the
French school of "Analyse des Données" and is based
on the use of the duality diagram. We present the theory of
the duality diagram and discuss its implementation in ade4.
Classes and main functions are presented. An example is
given to illustrate the ade4 philosophy.

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