[R] plot(bclust) what is the 2nd plot?

Friedrich.Leisch@tuwien.ac.at Friedrich.Leisch at tuwien.ac.at
Wed Mar 9 12:14:48 CET 2005

>>>>> On Wed, 9 Mar 2005 10:36:49 -0000,
>>>>> Jacqueline Hall (JH) wrote:

  > Hi everyone,
  > Currently i'm trying to understand the bagged clustering algorithm, bclust
  > {e1071}. 
  > When I run the given example in the help file (as below)
  >   data(iris)
  >      bc1 <- bclust(iris[,1:4], 3, base.centers=5)
  >      plot(bc1)

  > and plot the bclust object, 2 graphs are produced. 
  > The first is a dendrogram, but what is the second plot? The axes are not
  > labelled and what do the two lines represent?

The monotonic decreasing line gives the relative height of the split
of tyhe tree into 2, 3, etc. branches, the second line is the first
differences of the first. A peak in the differencescan be used as a
crude estimation for the number of clusters.

  > I tried looking in the URL
  > given in the references but that didn't help.

Look at Section IV.A of the working paper.


                        Friedrich Leisch 
Institut für Statistik                     Tel: (+43 1) 58801 10715
Technische Universität Wien                Fax: (+43 1) 58801 10798
Wiedner Hauptstraße 8-10/1071
A-1040 Wien, Austria             http://www.ci.tuwien.ac.at/~leisch

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