EMSS - Some EM-Type Estimation Methods for the Heckman Selection Model
Some EM-type algorithms to estimate parameters for the
well-known Heckman selection model are provided in the package.
Such algorithms are as follow: ECM(Expectation/Conditional
Maximization), ECM(NR)(the Newton-Raphson method is adapted to
the ECM) and ECME(Expectation/Conditional Maximization Either).
Since the algorithms are based on the EM algorithm, they also
have EM’s main advantages, namely, stability and ease of
implementation. Further details and explanations of the
algorithms can be found in Zhao et al. (2020) <doi:
10.1016/j.csda.2020.106930>.
