| QICD-package | Estimation of coefficients of nonconvex penalized quantile regression model |
| allzero | Judge an all zero vector |
| checkloss | Obtain the checkloss for quantile regression |
| QBIC | High dimensional BIC for quantile regression model |
| QICD | Fit a nonconvex penalized quantile regression model |
| QICD.BIC | BIC for QICD on tuning parameter searching |
| QICD.cv | Cross-validation for QICD |