
Probability mass function and random generation for the zero-inflated Poisson distribution.
dzip(x, lambda, pi, log = FALSE)pzip(q, lambda, pi, lower.tail = TRUE, log.p = FALSE)
qzip(p, lambda, pi, lower.tail = TRUE, log.p = FALSE)
rzip(n, lambda, pi)
vector of quantiles.
vector of (non-negative) means.
probability of extra zeros.
logical; if TRUE, probabilities p are given as log(p).
logical; if TRUE (default), probabilities are
vector of probabilities.
number of observations. If length(n) > 1
,
the length is taken to be the number required.
Probability density function
x <- rzip(1e5, 6, 0.33)
xx <- -2:20
plot(prop.table(table(x)), type = "h")
lines(xx, dzip(xx, 6, 0.33), col = "red")
xx <- seq(0, 20, by = 0.01)
plot(ecdf(x))
lines(xx, pzip(xx, 6, 0.33), col = "red")
Run the code above in your browser using DataLab