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...on kmeans and if we can change this distance. Indeed, in the function pam, we can put a distance matrix in parameter (by the line "pam<-pam(dist(matrixdata),k=7)" ) but we can't do it in the function kmeans, we have to put the matrix of data directly ... Thanks in advance, Nicolas BOUGET

...described for instance in Legtendre & Legendre (1998) ? In other words, in a community ecology analysis, I would like to calculate the correlation between two dissimilarity matrices, controlling for a third distance matrix representing geographical distances between sites. Thanks! Christophe Bouget Biodiversité et gestion des forêts de plaine - Ecosylv Ecosystèmes forestiers et paysages Institut de recherches pour l'ingénierie de l'agriculture et de l'environnement - CEMAGREF Domaine des Barres F-45 290 Nogent-sur-Vernisson [[alternative HTML version deleted]]

Hi, Is there a equivalent of the function "eboulis()" (which is a new funtion on Splus) on R? Otherwise, with which function can we see the best number of cluster we have to choose? Thanks in advance, Nicolas BOUGET

...The 'hclust' function is based an Algorithm contributed to STATLIB by F. Murtagh and the code is written in C. Probably the differences between agnes and hclust causes from the different code and the different implementation. Matthias > -----Urspr??ngliche Nachricht----- > Von: n.bouget [mailto:n.bouget at laposte.net] > Gesendet: Dienstag, 25. Mai 2004 09:39 > An: R-help > Betreff: [R] Question > > > [R]:Agnes vs Hclust > > Hi, > I want to know if there is a difference between the two > hierarchical methods Agnes and hclust when there are used...

...cuted the following program: hc <- hclust(dist(AGRIINSTTableFinaleCR), "ward") agnes<-agnes(dist(AGRIINSTTableFinaleCR),method="ward") And clusters are not the same even if they are a little similar! Is anybody know why i have this difference? Thanks in advance Nicolas BOUGET