Figure 2.

Graphical display of the five distributions, all with rate parameter 5, used in the simulations (Poisson [Var = 5], negative binomial [NB13, Var = 13], negative binomial [NB40, Var = 40], negative binomial [NB 70, Var = 70] and zero-inflated Poisson [ZIP, p = 0.2, Var = 8]).

Horton et al. BMC Medical Research Methodology 2007 7:9   doi:10.1186/1471-2288-7-9
Download authors' original image