zigamma2: Zero-inflated and reparameterised gamma distribution

In RTMBdist: Distributions Compatible with Automatic Differentiation by 'RTMB'

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)

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.

Value

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

Examples

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

RTMBdist documentation built on April 1, 2026, 5:07 p.m.