Cluster Properties
The following properties are available for the
cluster tool:
Name
enables you to specify
the name for this model.
Cluster Matrix
-
Number of clusters specifies the number of
clusters that are generated.
-
-
Initial assignment specifies the method that is used to create the initial cluster assignments. The
available methods are:
-
Forgy specifies
that
k data points are selected at random to use as the
centroids of the
k clusters.
-
-
Visible roles determines
how many effects are shown in the
Cluster Matrix. Valid values are
integers between 2 and 6, inclusive.
When you specify a
value n, the first n effects
listed in the Variables table on the Roles tab
are displayed. To change the effect pairs that are plotted in the Cluster
Matrix, you can remove an effect from the analysis, and
then immediately add it back in. The clustering results remain unchanged
because you are using the same input data. However, the Variables table
adds new effects to the bottom of the list.
-
Variable standardization transforms the effect variables so that they have a mean of zero and a
standard deviation of 1. This property is
enabled by default and affects the results displayed in the details table. The
Cluster Matrix window
and the
Parallel Coordinates window display
the original variables.
Parallel Coordinates
-
Number of bins specifies the number of
bins used when generating the parallel coordinate polyline
plots.
-
Maximum polylines specifies
the maximum number of polylines generated by the parallel coordinate
algorithm.
-
Visible roles determines
how many effects are shown in the
Parallel Coordinates plot. Valid values are integers between 2 and 10, inclusive.
Show ellipses
enables you to display the cluster projection ellipses in the Cluster Matrix.
Show centroids
enables you to display the centroids in the Cluster Matrix.
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