RTMBdist (version 0.1.0)

zipois: Zero-inflated Poisson distribution

Description

Probability mass function, distribution function, and random generation for the zero-inflated Poisson distribution.

Usage

dzipois(x, lambda, zeroprob = 0, log = FALSE)
pzipois(q, lambda, zeroprob = 0, lower.tail = TRUE, log.p = FALSE)
rzipois(n, lambda, zeroprob = 0)

Value

dzipois gives the probability mass function, pzipois gives the distribution function, and rzipois generates random deviates.

Arguments

x, q

integer vector of counts

lambda

vector of (non-negative) means

zeroprob

zero-inflation probability between 0 and 1

log, log.p

logical; return log-density if TRUE

lower.tail

logical; if TRUE, probabilities are \(P[X \le x]\), otherwise, \(P[X > x]\).

n

number of random values to return.

Details

This implementation allows for automatic differentiation with RTMB.

Examples

set.seed(123)
x <- rzipois(1, 0.5, 1)
d <- dzipois(x, 0.5, 1)
p <- pzipois(x, 0.5, 1)