Message-ID: <3EC354FB.1090902@curie.fr>
Date: 2003-05-15T08:51:07Z
From: Philippe Hupé
Subject: hclust function
In-Reply-To: <D15343265276D31197BC00A024A6C110774052@EXS_BDC>
I am trying to use hclust function from mva package but I can't
understand what the variable height stands for when I use the ward
criterion. Here is a small example :
library(mva)
x <- c(1,2,3,4)
cluster <- hclust(dist(x), method="ward")
cluster$height
cluster$height = 1 1 3 but it is supposed to be 0.5 0.5 4
the distance between clusters is Ni*Nj/(Ni+Nj)*||Gi-Gj||^2 and
cluster$height does not match with this distance.
Does someone has any idea ?
Thanks in advance.
Philippe Hup?
--
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Philippe Hup?
Institut Curie - Equipe Bioinformatique
26, rue d'Ulm - 75005 PARIS France
+33 (0)1 42 34 65 29
Philippe.Hupe at curie.fr <mailto:Philippe.Hupe at curie.fr>