| beta_AD | Caculate the estimators of beta on the A-opt and D-opt | 
| beta_cor | Caculate the estimator of beta on the COR | 
| LICnew | Calculate the LIC estimator based on A-optimal and D-optimal criterion | 
| terr | terr function is used to generate a dataset where the error term follows a T-distribution | 
| TLIC | TLIC function based on LIC with T-distributed errors |