This function returns the upper bound of the quantile region to which the record is assigned. A value of 98 means that at least 2% of the training data has a larger predicted value than the current record, or the predicted value is equal to the value of the current record. The value is returned from results data that is produced when you apply an RBF Regression model that contains quantile information. If the RBF model does not contain quantile information, NULL is returned.
This might occur if the results value is not computed based on an RBF Regression model, or if the record contains too many missing values to make a prediction.