R help - Sep 2005 - library (tree)- which samples belong to each terminal branch?

Dear all

 

What I would like to know is if there is a way to know which specific
samples fall within a terminal branch created by tree? The classification
summarizes data, but I want to know which specific samples fall within each
classification (branch in the dendrogram). 

 

Data contains site codes and multiple fields describing the characters of a
single specimen of grass growing there. Each sample is an individual plant
from a site, all plants are similar to each other, but may represent
different species. I classified species using tree and these are labeled by
site name. The classification gives me a nice separation of supposed species
in terms of only 3 sites but with some sites occurring on more than one
terminal branch, this obviously summarizes one or more species/sites on each
branch of the dendrogram. So back to my question, how do I find out which
samples fall within each branch?

 

Cheers

 

Chris Buddenhagen, Botany Department, Charles Darwin Research Station, Santa
Cruz,Galapagos. Mail: Charles Darwin Foundation, Casilla 17-01-3891 Avenida
6 de Diciembre N36-109 y Pasaje California Quito, ECUADOR

 





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On Mon, 19 Sep 2005, Chris Buddenhagen wrote:
> What I would like to know is if there is a way to know which specific
> samples fall within a terminal branch created by tree? The classification
> summarizes data, but I want to know which specific samples fall within each
> classification (branch in the dendrogram).
Please read the help page (as we do ask).  Component `where' in the 
returned object tells you the information you are seeking.

If you want this for new data, predict.tree has a type="where" to tell
you.
> Data contains site codes and multiple fields describing the characters of a
> single specimen of grass growing there. Each sample is an individual plant
> from a site, all plants are similar to each other, but may represent
> different species. I classified species using tree and these are labeled by
> site name. The classification gives me a nice separation of supposed
species
> in terms of only 3 sites but with some sites occurring on more than one
> terminal branch, this obviously summarizes one or more species/sites on
each
> branch of the dendrogram. So back to my question, how do I find out which
> samples fall within each branch?
-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595