Parameters | Studies | Lock-In Continuous Predictor Variables

Lock-In Continuous Predictor Variables
Use this field to specify continuous/quantitative variables to always include in the model.
Variables specified here are not considered in subsequent predictor reduction steps.
To Specify One or More Lock-In Continuous 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 Continuous Predictor Variables field, as shown below: