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• 1st method : ACP

• 2nd method : Hierarchical cluster analysis

In the library Hmisc, varclus draws a variable clustering dendrogram.
See in :

​http://www.mced-ecology.org/wp-content/uploads/2011/02/Dormann_Kaschner_MCED2.pdf

To reduce the collinearity we selected one variable from each cluster independently in the model.

​http://www.epa.gov/caddis/da_exploratory_5.details.html
Venables and Ripley (2002) ​http://www.stats.ox.ac.uk/pub/MASS4/