References/Notes/Attributions:
Source
Journal of Applied Econometrics data archive http://qed.econ.queensu.ca/jae/1998-v13.2/vella-verbeek/.
References
Vella F, Verbeek M (1998). “Whose wages do unions raise? A dynamic model of unionism and wage rate determination for young men.” Journal of Applied Econometrics, 13, 163–183.
Verbeek M (2004). A Guide to Modern Econometrics. Wiley.