Use this option to specify the maximum number of effects constructed from the predictor variables specified on the General tab.
Either type the desired number of effects in the model into 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 from the pop-up menu. Change the upper and/or lower boundaries in the window that appears, to rescale the slider and click .