Cluster Variables

Use this field to specify those variables that identify clusters in a clustered sample design. The combinations of categories of these variables define the clusters in the sample.

Note : If there are Strata Variables selected, clusters are nested within strata.

To Specify One or More Cluster Variables:

Specify the Input SAS Data Set .

All of the variables in the specified input data set are displayed in the Available Variables field.

Examine the list of available variables.

Highlight the variable whose values identify clusters. To highlight multiple variables at once, hold down Ctrl while left-clicking on them.

Click to add the highlighted variable(s) to the Cluster Variables field, as shown below: