User Guide

462
Chapter 31
TwoStep Clus
ter Analysis Plots
Figure 31-3
TwoStep Cluster Analysis Plots dialog box
Within cluster percentage chart. Displays charts showing the within-cluster variation
of each variable. For each categorical variable, a clustered bar chart is produced,
showing the category frequency by cluster ID. For each continuous variable, an error
bar chart is produced, showing error bars by cluster ID.
Cluster pie chart. Displays a pie chart showing the percentage and counts of
observations within each cluster.
Variable Importance Plot. Displays several different charts showing the importance
of each variable within each cluster. The output is sorted by the importance rank
of each variable.
 Rank Variables. This option determines whether plots will be created for each
cluster (
By variable) or for each variable (By cluster).
 Importance Measure. This option allows you to select which measure of variable
importance to plot.
Chi-square or t-test of significance reports a Pearson chi-square
statistic as the importance of a categorical variable and a t statistic as the
importance of a continuous variable.
Significance reports one minus the p value