Two-Part Multiple Spell Models for Health Care Demand
João Santos Silva,
Frank Windmeijer
Journal of Econometrics,
vol. 104, 2001, p. 67-89.
Endogeneity in Count Data Models: An Application to Demand for Health Care
Frank Windmeijer,
João Santos Silva
Journal of Applied Econometrics,
vol. 12, 1997, p. 281-294.