See homals package in R. But also look documents for ade4 package. 
 
Justin BEM
BP 1917 Yaoundé
Tél (237) 76043774
 



________________________________
De : Galanidis Alexandros <agal@env.aegean.gr>
À : "r-help@r-project.org" <r-help@r-project.org>
Envoyé le : Vendredi, 6 Mars 2009, 10h09mn 18s
Objet : [R] PCA and categorical data

Hi all,

I' m trying to figure out if it is appropriate to do a PCA having only categorical data (not ordinal). I have only find the following quote:

One method to find such relationships is to select appropriate variables and
to view the data using a method like Principle Components Analysis (PCA) [4].
This approach gives us a clear picture of the data using KL-plot of the PCA.
However, the method is not settled for the data including categorical data.
[http://hp.vector.co.jp/authors/VA038807/personal/covEigGiniRep17.pdf]

but I'm still not sure if it WRONG to do so.

Any opinion or reference would be very helpful

thanks

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