| HCinitial | Two-Step Method for Parameter Estimation of the Heckman Model |
| HeckmanBS | Heckman BS Model fit Function |
| HeckmanCL | Classic Heckman Model fit Function |
| HeckmanGe | Function for fit of the Generalized Heckman Model |
| HeckmanSK | Normal Skew Model fit Function |
| HeckmantS | Heckman-t Model fit Function |
| IMR | Inverse Mills Ratio |
| MEPS2001 | Medical Expenditure Panel Survey |
| Mroz87 | U.S. Women's Labor Force Participation |
| nhanes | US National Health and Nutrition Examination Study |
| PSID2 | Panel Study of Income Dynamics |
| RandHIE | RAND Health Insurance Experiment |
| ssmodels | ssmodels: A package for fit the sample selection models. |
| step2 | Heckman's two-step method |
| summary.HeckmanBS | Summary of Birnbaum-Saunders Heckman Model |
| summary.HeckmanCL | Summary of Classic Heckman Model |
| summary.HeckmanGe | Summary of Generalized Heckman Model |
| summary.HeckmanSK | Summary of Skew-Normal Heckman Model |
| summary.HeckmantS | Summary of Heckman-ts Model |
| twostep | Heckman's two-step method |