make_error              Simulate an error term
make_square_grid        Create a square grid
make_wx                 Create Spatial Lags of variables
make_wxg                Calculate the effect of spatially lagged X
                        variables
make_x_bivariate        Simulate X variables
make_xb                 Calculate predicted X values based on
                        coefficients
sim_durbin              Simulate the Spatial Durbin Model
sim_error               Simulate Spatial Error Process
sim_gns                 Simulate General Nested Model
sim_grid_listw          Generate spatial weights matrix for a grid
sim_mess                Simiulate Matrix Exponential Spatial Lag Model
sim_ols                 Simulate OLS
sim_sar                 Simulate Spatial Lag Model (SAR)
sim_sarar               Simulate the Spatial Autoregressive Model with
                        Autoregressive Errors
sim_sem                 Simulate Spatial Error Model (SEM)
sim_slx                 Simulate Spatially Lagged X (SLX) model
sim_slx_error           Simulate Spatially Lagged X Error Model
