twostep | R Documentation |
Estimate model parameters via two-step method
twostep(selection, outcome, data = sys.frame(sys.parent()))
selection |
Selection equation. |
outcome |
Primary Regression Equation. |
data |
Database. |
Returns a numerical vector with the parameter estimates of the Classical Heckman model via a two-step method. For more information see \insertCiteheckman1979sample;textualssmodels
data(MEPS2001) attach(MEPS2001) selectEq <- dambexp ~ age + female + educ + blhisp + totchr + ins + income outcomeEq <- lnambx ~ age + female + educ + blhisp + totchr + ins twostep(selectEq, outcomeEq)
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