I want to draw a QQ plot for Negative Binomial distribution to see if the Generalized linear model fit well or not. But since there is no normality assumption exist in my model, normal QQ plot will not be suitable in this case. What kind of plot should I do? And how can I do it in R?
I can not simply use qqplot(negative binomial, data). I am writing a function including this plot, and the data for observations and variables are the things I will put in after I write down the function, and they are not fixed values. So I do not have a fixed form for the negative binomial part. However, what I want to know is the fit of the model, so I need to create something else to check that.