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 * 1st method : [["ACP"]]

 * 2nd method : Hierarchical cluster analysis
In the library Hmisc, varclus draws a variable clustering dendrogram.[[BR]]
See in :[[BR]]

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 [[BR]]

Venables and Ripley (2002)[[BR]]
http://www.stats.ox.ac.uk/pub/MASS4/ [[BR]]
http://www.planta.cn/forum/files_planta/modern_applied_statistics_with_s_192.pdf [[BR]]

Harrell [[BR]]
http://lib.stat.cmu.edu/S/Harrell/doc/splus.pdf [[BR]]