PLOT Subcommand (CLUSTER command)

PLOT controls the plots produced for each method specified on the METHOD subcommand. For icicle plots, PLOT allows you to control the cluster solution at which the plot begins and ends and the increment for displaying intermediate cluster solutions.

  • If the PLOT subcommand is omitted or included without specifications, a vertical icicle plot is produced.
  • If any keywords are specified on PLOT, only those plots requested are produced.
  • The icicle plots are generated as pivot tables and the dendrogram is generated as text output.
  • If there is not enough memory for a dendrogram or an icicle plot, the plot is skipped and a warning is issued.
  • The size of an icicle plot can be controlled by specifying range values or an increment for VICICLE or HICICLE. Smaller plots require significantly less workspace and time.

VICICLE(min,max,inc). Vertical icicle plot. This is the default. The range specifications are optional. If used, they must be integer and must be enclosed in parentheses. The specification min is the cluster solution at which to start the display (the default is 1), and the specification max is the cluster solution at which to end the display (the default is the number of cases minus 1). If max is greater than the number of cases minus 1, the default is used. The increment to use between cluster solutions is inc (the default is 1). If max is specified, min must be specified, and if inc is specified, both min and max must be specified. If VICICLE is specified more than once, only the last range specification is used.

HICICLE(min,max,inc). Horizontal icicle plot. The range specifications are the same as for VICICLE. If both VICICLE and HICICLE are specified, the last range specified is used for both. If a range is not specified on the last instance of VICICLE or HICICLE, the defaults are used even if a range is specified earlier.

DENDROGRAM. Tree diagram. The dendrogram is scaled by the joining distances of the clusters.

NONE. No plots.

Example

CLUSTER V1 V2 V3 /PLOT=VICICLE(1,20).
  • This example produces a vertical icicle plot for the 1-cluster through the 20-cluster solution.

Example

CLUSTER V1 V2 V3 /PLOT=VICICLE(1,151,5).
  • This example produces a vertical icicle plot for every fifth cluster solution starting with 1 and ending with 151 (1 cluster, 6 clusters, 11 clusters, and so on).