200 or more cases

To Obtain a K-Means Cluster Analysis

This feature requires the Statistics Base option.

1. From the menus choose:

   Analyze > Classify > K-Means Cluster...

2. Select the scale, numeric variables to be used in the cluster analysis.
3. Specify the number of clusters.

For maximum efficiency, take a sample of cases and use the Iterate and classify method to determine cluster centers. Click Centers and select Write final as File. Then restore the entire data file, select Classify only as the Method. Click Centers and Read initial from File to classify the entire file using the centers estimated from the sample.