Linear-Bilinear Model Use the drop-down menu to specify the type of linear-bilinear model to fit. Available model types are described in the table below: Model: Description: AMMI Additive Main Effects and Multiplicative Interactions. Includes Intercept, G1, and E2. GREG Genotype regression. Includes Intercept and G. SREG (GGE) Site Regression. Includes Intercept and E. SHMM Shifted Multiplicative Model. Includes Intercept. COMM None. 1 Genotypic Effects 2 Environmental Effects To Specify the Model: Select the desired model using the drop-down menu.