| 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 | 
| serr | Generate data with skewed errors | 
| SLIC | SLIC function based on LIC with skewed error distributions |