Parameters | Predictive Modeling | Lock-In Categorical Predictor Variables

Lock-In Categorical Predictor Variables
Use this field to specify qualitative variables to always include in the model.
For each level of thesePredictor Categorical Variables, numeric indicator variables of 0s and 1s indicating category membership are constructed when necessary.
Variables specified here are not considered in subsequent predictor reduction steps.
To Specify One or More Categorical Predictor Variables:
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All of the variables in the input data set are displayed in the Available Variables field.
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Click to add the highlighted variable(s) to the Lock-In Predictor Categorical Variables field, as shown below: