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dendrogram ultrametrics
2 messages · Lisa.Holman@npws.nsw.gov.au, Christian Hennig
Dear Lisa, as far as I know, there is no implementation of dendrogram ultrametrics, but it could be easily computed from the output of hclust (package mva) or agnes (package cluster) in the following manner: 1) Generate the desired dendrogram by hclust or agnes. 2) Generate partitions for all levels by cutree. 3) For a given pair of objects, determine the level on which they are joined. 4) Take the height component of the output object of hclust or agnes at this level. Perhaps it can be done faster by intelligent use of the merge component of the output object. (Note that I didn't try it, so all this assumes that the help pages are correct and I understood them...) Best, Christian
On Mon, 23 Feb 2004 Lisa.Holman at npws.nsw.gov.au wrote:
Dear R-help listers, Is anyone aware of a function that outputs dendrogram ultrametrics? Cheers, Lisa. PS please reply to me personally as well as to the list because the website wasn't letting me subscribe for some reason. thanks... Lisa Holman Research Officer, Vegetation Dynamics Policy & Science Division NSW Department of Environment & Conservation PO Box 1967, Hurstville 2220. ph 02 9585 6507 fax 02 9585 6606 email lisa.holman at npws.nsw.gov.au The NPWS is part of the new Department of Environment & Conservation This message is intended for the addressee named and may contain confidential information. If you are not the intended recipient, please notify the sender and then delete the message. Views expressed in this message may be those of the individual sender, and are not necessarily the views of the NSW Department of Environment and Conservation. [[alternative HTML version deleted]]
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*********************************************************************** Christian Hennig Fachbereich Mathematik-SPST/ZMS, Universitaet Hamburg hennig at math.uni-hamburg.de, http://www.math.uni-hamburg.de/home/hennig/ ####################################################################### ich empfehle www.boag-online.de