diana.object: Divisive Analysis (DIANA) Object
Description
The objects of class "diana"
represent a divisive hierarchical clustering of a dataset.Value
- A legitimate
diana object is a list with the following components: - ordera vector giving a permutation of the original observations to allow for
plotting, in the sense that the branches of a clustering tree will not cross.
- order.laba vector similar to
order, but containing observation labels instead of
observation numbers. This component is only available if the original
observations were labelled. - heighta vector with the diameters of the clusters prior to
splitting.
- dcthe divisive coefficient, measuring the clustering structure of the dataset.
For each observation i, denote by d(i) the diameter of the last cluster to
which it belongs (before being split off as a single observation),
divided by the diameter of the whole dataset.
The
dc is the average of all 1 - d(i). It can also be seen as the average
width (or the percentage filled) of the banner plot.
Because dc grows with the number of observations, this measure should not
be used to compare datasets of very different sizes. - mergean (n-1) by 2 matrix, where n is the number of
observations. Row i of
merge describes the split at step n-i of
the clustering. If a number j in row r is negative, then the single
observation |j| is split off at stage n-r. If j is positive, then the
cluster that will be splitted at stage n-j (described by row j), is
split off at stage n-r. - dissan object of class
"dissimilarity", representing the total
dissimilarity matrix of the dataset. - dataa matrix containing the original or standardized measurements, depending
on the
stand option of the function agnes. If a dissimilarity matrix was
given as input structure, then this component is not available.
GENERATION
This class of objects is returned from diana.METHODS
The "diana" class has methods for the following generic functions:
print, summary, plot.INHERITANCE
The class "diana" inherits from "twins".
Therefore, the generic function pltree can be used on a
diana object.