# Sample Selection Models

## Documentation for package ‘ssmodels’ version 2.0.2

- DESCRIPTION file.
- Package NEWS.

## Help Pages

extract_model_components | Extract model components from formulas
HCinitial | Two-Step Method for Parameter Estimation of the Heckman Model
HeckmanBS | Heckman BS Model fit Function
HeckmanCL | Classic Heckman Model fit Function
HeckmanGe | Generalized Heckman Model Estimation
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
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-t Model
twostep | Heckman's two-step method