To run a cluster analysis with four clusters, reopen the K-Means Cluster Analysis dialog box.

Type 4 as the number of clusters.

Click Save.

Select Cluster membership and Distance from cluster center.

Click Continue.

Click OK in the K-Means Cluster Analysis dialog box.

These selections produce a four-cluster solution. The distances from cluster center and cluster membership information for each case are saved to the working file as new variables.

The saved variables can be used to create a useful boxplot. From the menus, choose:

Graphs
Boxplot...

Click Define.

Select Distance of Case from its Classification Cluster Center as the analysis variable.

Select Cluster Number of Case as the category axis variable.

Click OK.