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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/
http://www.planta.cn/forum/files_planta/modern_applied_statistics_with_s_192.pdf
