NEWS

---

ssmrob 1.0 (2021-08-20)

• Documentation was updated. The current version accompanies the publication in the Journal of Statistical Software, <doi:10.18637/jss.v099.i04>

ssmrob 0.8 (2020-04-02)

• Data argument was added for functions ssmrob, heckitrob, heckit5rob and etregrob.
• The datasets were updated: binary variables are logical now. Several variables with missing documentation were removed from MEPS2001 dataset. Documentation for datasets was updated.
• Computation of the (co)variance matrix for the estimator was made more efficient.
• NAMESPACE was updated: instead of package namespaces (MASS, robustbase, sampleSelection) only the necessary functions are imported.

ssmrob 0.7 (2019-07-19)

• Generic functions nobs and model.matrix were added.
• print and summary outputs were adjusted to mimic more standard R model printing outputs.
• fitted model objects were extended, see documentation.

ssmrob 0.6 (2019-05-16)

• Order of arguments in functions ssmrob, heckitrob, heckit5rob, etregrob was changed. The selection formula is first, the outcome formula(s) is second.

ssmrob 0.5 (2018-12-09)

• Number of digits after comma in print functions reduced to 4.
• Chi-square probability for covariate weights is 0.95, it was 0.9.
• Splitted weight calculation for design space is introduced (see Zhelonkin, Genton, Ronchetti 2016, p.814).
• etregrob function is added, robust estimation for Endogenous Treatment Model.