I used the function 'zeroinfl' from the 'pscl' package to fit a zero-inflated model with negative binomial distribution (zinb). Results show significant interaction effects and I should do simple slope analyses for some of the interactions.
The packages I have tried to use for simple slope analysis (jtools, sjPlot, rockchalk, multcomp, QuantPsyc) however, cannot handle zero-inflated models. (Most of them can be used for lm, glm, but not for zinb models).
Does anyone know a package that I could use for zinb?
Alternatively, is there an easy way to calculate and test simple slopes in zinb?
Below is my model, where Gender is a factor with 2 levels,
A,B,C,D,E,F,G,H are continuous variables, all centered.
I want to do simple slope tests for the count model for
E x Gender,
F x Gender,
H x Gender
Any help is highly appreciated! Thanks!