The CLUSTER Procedure

Statistical procedures use ODS Graphics to create graphs as part of their output. ODS Graphics is described in detail in Chapter 24, Statistical Graphics Using ODS.

Before you create graphs, ODS Graphics must be enabled (for example, by specifying the ODS GRAPHICS ON statement). For more information about enabling and disabling ODS Graphics, see the section Enabling and Disabling ODS Graphics in Chapter 24, Statistical Graphics Using ODS.

The overall appearance of graphs is controlled by ODS styles. Styles and other aspects of using ODS Graphics are discussed in the section A Primer on ODS Statistical Graphics in Chapter 24, Statistical Graphics Using ODS.

PROC CLUSTER can produce plots of the cubic clustering criterion, pseudo F, and pseudo statistics, and a dendrogram. To plot a statistic, you must ask for it to be computed via one or more of the CCC, PSEUDO, or PLOT options.

You can reference every graph produced through ODS Graphics with a name. The names of the graphs that PROC CLUSTER generates are listed in Table 5, along with the required statements and options.

Table 5: Graphs Produced by PROC CLUSTER

ODS Graph Name	Plot Description	Statement and Option
CubicClusCritPlot	Cubic clustering criterion for the number of clusters	PROC CLUSTER PLOTS=CCC
PseudoFPlot	Pseudo F criterion for the number of clusters	PROC CLUSTER PLOTS=PSF
PseudoTSqPlot	Pseudo criterion for the number of clusters	PROC CLUSTER PLOTS=PST2
CccAndPsTSqPlot	Cubic clustering criterion and pseudo	PROC CLUSTER PLOTS=(CCC PST2)
CccAndPsfPlot	Cubic clustering criterion and pseudo F	PROC CLUSTER PLOTS=(CCC PSF)
CccPsfAndPsTSqPlot	Cubic clustering criterion, pseudo F, and pseudo	PROC CLUSTER PLOTS=ALL
Dendrogram	Dendrogram (tree diagram)	PROC CLUSTER PLOTS=DENDROGRAM