Variability Assumption Use this feature to specify the assumption made on the variances . Available options are described in the table below: Criteria Description Homoscedastic Assumes that the magnitude of the variance in the relationship between the independent and dependent variables is the same across the independent variables. Heteroscedastic Assumes that the magnitude of the variance in the relationship between the independent and dependent variables differs across the independent variables. To Specify the Assumption Type: Select the desired type by clicking within the appropriate radio button.