Number of Predictors Included in Model Use the field/slider to specify the number of predictors to be included in the model. To Specify the Number of Predictors Included in the Model: Select Score as the Variable Selection Method. Either type the desired number of predictors in the text field or move the slider to the right or to the left to specify a value. Tip: To change the scale of the slider, right-click on the slider and select Rescale Slider from the pop-up menu. Change the upper and/or lower boundaries in the window that appears, to rescale the slider and click OK.