library(fitdistrplus)
library(actuar)

set.seed(1234)

n <- 1e3
x <- rztpois(n, 2)

fitdistrplus:::startarg_discrete_actuar_family(x, "ztpois")
fitdist(x, "ztpois")


fitdistrplus:::startarg_discrete_actuar_family(x, "ztnbinom")
fitdist(x, "ztnbinom")


fitdistrplus:::startarg_discrete_actuar_family(x, "ztgeom")
fitdist(x, "ztgeom")

library(actuar)
x <- rztbinom(n, 30, 1/2)

fitdistrplus:::startarg_discrete_actuar_family(x, "ztbinom")
fitdist(x, "ztbinom", lower=0)