| Aopt | Calculate the A-optimal design under the second-order Least squares estimator |
| calc_phiA | Calculate the loss function of the A-optimal design |
| calc_phiD | Calculate the loss function of the D-optimal design |
| Dopt | Calculate the D-optimal design under the SLSE |
| plot_direction_Aopt | Verify the optimality condition for the A-optimal design |
| plot_direction_Dopt | Verify the optimality condition for the D-optimal design |
| plot_weight | Plot the weight distribution of the optimal design for univaraite regression model |