Desmarais, Bruce A.; Harden, Jeffrey J. - In: Stata Journal 13 (2013) 4, pp. 810-835
The proportion of zeros in event-count processes may be inflated by an additional mechanism by which zeros are created. This has given rise to statistical models that accommodate zero inflation; these are available in Stata through the zip and zinb commands. The Vuong (1989, Econometrica 57:...