RTMBdist (version 0.1.0)

zigamma2: Zero-inflated and reparameterised gamma distribution

Description

Density, distribution function, and random generation for the zero-inflated gamma distribution reparameterised in terms of mean and standard deviation.

Usage

dzigamma2(x, mean = 1, sd = 1, zeroprob = 0, log = FALSE)
pzigamma2(q, mean = 1, sd = 1, zeroprob = 0)
rzigamma2(n, mean = 1, sd = 1, zeroprob = 0)

Value

dzigamma2 gives the density, pzigamma2 gives the distribution function, and rzigamma generates random deviates.

Arguments

x, q

vector of quantiles

mean

mean parameter, must be positive.

sd

standard deviation parameter, must be positive.

zeroprob

zero-inflation probability between 0 and 1.

log

logical; if TRUE, probabilities/ densities \(p\) are returned as \(\log(p)\).

n

number of random values to return

Details

This implementation allows for automatic differentiation with RTMB.

Examples

x <- rzigamma2(1, 2, 1, 0.5)
d <- dzigamma2(x, 2, 1, 0.5)
p <- pzigamma2(x, 2, 1, 0.5)