Displays a dialog for the creation of the Qualitative (Multiple Linear Regression) Model using the Reverse Stepwise MLR algorithm. This algorithm starts with the regression built using all Parameters from the active set, and consecutively removes least significant parameters one by one. A number of Models is created, and their R2 values are calculated. The vertical slider line on the graph selects the combination of the number of descriptors and R2 for a model. The list contains the names of descriptors used in the model.