Fig. 3From: Statistical models for analyzing count data: predictors of length of stay among HIV patients in Portugal using a multilevel modelComparisons among observed versus predicted probabilities among count models (N = 26,505). PRM – Poisson Regression Model; NBRM – Negative Binomial Regression Model, ZIP – Zero-inflated Poisson; ZINB – Zero-inflated Negative BinomialBack to article page