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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.
