| CaseDeletion | Case deletion analysis for Heckman selection model | 
| HeckmanEM | Fit the Normal, Student-t or Contaminated normal Heckman Selection model | 
| HeckmanEM.criteria | Model selection criteria for the Heckman Selection model | 
| HeckmanEM.envelope | Envelope for the Heckman Selection model | 
| HeckmanEM.infomat | Standard error estimation for the Heckman Selection model by the Information Matrix | 
| Influence | Influence Analysis for the Heckman Selection model | 
| rHeckman | Data generation from the Heckman Selection model (Normal, Student-t or CN) |