Fig. 3
From: A comparison of zero-inflated and hurdle models for modeling zero-inflated count data
Probabilities of observing a zero (green), a sampling zero (blue) and their differences (black) against the covariate, when the data are simulated from a HNB model with a continuous covariate of sample size n=300. The intercepts for both the zero and truncated counts components are set as 1. The regression coefficients of the covariate for the zero (β1) and the truncated counts component (α1) are set as -2, -1.5, -1, -0.1, 0.1, 1, 1.5 and 2