Re: Ou couper l'arbre ?

From: Agustin Lobo (
Date: Wed Jun 04 1997 - 16:03:29 MET DST

I normally make a plot of the Wilk's ratio against the number
of classes. (Wilks=det(W)/det(T), W: pooled within-class
cov. matrix; T: total cov. matrix). This plots would be a negative
exponential for a totally unstructured tree, so the plot allows one
to identify singular points where an increase of 1 more
class implies a large decrease of the Wilk's ratio.


Dr. Agustin Lobo
Instituto de Ciencias de la Tierra (CSIC)
Lluis Sole Sabaris s/n
08028 Barcelona SPAIN
tel 34 3 330 2716
fax 34 3 411 0012

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