Attribute for Stratified Sample
Use this selection to select the attribute to use for stratification and to specify characteristics of the sample:
- Attribute Name: The attribute to be used for stratification; select an attribute from the dropdown list. Click Histogram to see a histogram of the selected attribute.
- Total number of cases: This read-only field displays the total number of cases in the table.
- Sample Size: Specify the sample size as either a number of cases or as a percentage of cases. The default is the smaller of the following two values:
- 10,000 cases
- Total number of cases
The value for sample size depends on the purpose for which you are creating the stratified sample. It may be useful to look at the summary statistics for the table when determining sample size.
Note: If you invoke this wizard from the Sample step of a classification activity, the attribute is selected to be the target attribute of the model. You cannot change this selection.
Click Next to continue. The wizard checks that valid values were specified; if there is a problem, the wizard generates a message.
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