Asymmetric Loss Fitting Proportion Use this option to specify a proportion for asymmetric loss calculations. The number you enter must be between 0 and 1. The specified value becomes the weight placed on positive residuals (which correspond to under-predictions). Negative residuals (over-predictions) are then weighted as one minus the specified value. For example, if over-predictions are to be weighted three times more than under-predictions, then specify 0.25. The value is analogous to the quantile level in quantile regression. To Specify the Proportion: Specify Asymmetric Loss T-Test as the Statistical Testing Method for Continuous Predictors. Type the desired value values in the text box.