Stat > Regression > Nonlinear Regression > Catalog > OK
Use to assign a predictor variable to each placeholder in the expectation function that you select from the catalog. These placeholders are indicated by an X in the expectation function. This dialog box appears after you press OK in the Catalog dialog box.
Choose an actual predictor for each placeholder:
Placeholder: Minitab automatically lists the placeholders that it detects within the expectation function.
Actual predictor: Enter the column that contains the predictor variable for each placeholder.