For each level of these predictor class variables , numeric indicator variables of 0s and 1s indicating class membership are constructed when necessary.All of the variables in the input data set are displayed in the Available Variables field.
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Highlight one or more variables. To highlight multiple variables at once, hold down while left-clicking on them.
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Clickto add the highlighted variable(s) to the Lock-In Predictor Class Variables field, as shown below: