[R] T-mode PCA

Victor Homar victor.homar at uib.es
Fri Dec 12 18:12:54 CET 2008


We are trying to classify atmospheric patterns using PCA and kmeans. In 
T-mode, the (non-normalized) loadings of the PCs are used as input 
variables for the k-means classification.

As first step we perform PCA using "princomp" but the computed loadings 
produced by princomp are normalized. In order to apply T-mode 
classification, we need the "non-normalized" loadings as they represent 
the correlation between old and new "axis".

How do we get the "non-normalized" loadings for the Principal Components?

Thanks for your help,


Víctor Homar Santaner
Grup de Meteorologia

Edif. Mateu Orfila                      Tel: +34 971 17 1376
Universitat de les Illes Balears        Fax: +34 971 17 3426
07122 Palma de Mallorca (SPAIN)         Email: Victor.Homar at uib.es

              Knowledge is contagious. Infect truth.

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