Prehn, Soren; Brummer, Bernhard - 2011
presence of excess zeros usual Poisson Pseudo MaximumLikelihood (PPML) is still consistent, the variance covariance matrix …. Staub & Winkelmann [2010] argue that zeroinflatedcount data models (i.e. zero-inflated Poisson / Negative Binomial …. Yet zero-inflated Poisson Quasi-Likelihood (PQL) is a reliable alternative. It is consistent even under model …