| F_est | Estimate the Conditional CDF of the Event Time given Covariates | 
| G_est | Estimate the Conditional CDF for the Left Truncation Time given Covariates | 
| simu | A Simulated Data Set under Left Truncation but No Right Censoring | 
| simu_c1 | A Simulated Data Set under Left Truncation and Right Censoring where Censoring can be before Truncation | 
| simu_c2 | A Simulated Data Set under Left Truncation and Right Censoring where Censoring is always after Truncation | 
| truncAIPW | Doubly Robust Estimation under Covariate-induced Dependent Left Truncation and No Censoring | 
| truncAIPW_cen1 | Doubly Robust Estimation under Covariate-induced Dependent Left Truncation and Noninformative Right Censoring where Censoring can be before Left Truncation | 
| truncAIPW_cen2 | Doubly Robust Estimation under Covariate-induced Dependent Left Truncation and Noninformative Right Censoring where Censoring is always after Left Truncation |