betabinom: Beta-binomial distribution

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

Beta-binomial distribution

Description

Density and random generation for the beta-binomial distribution.

Usage

dbetabinom(x, size, shape1, shape2, log = FALSE)

rbetabinom(n, size, shape1, shape2)

Arguments

x	vector of non-negative counts.
size	vector of total counts (number of trials). Needs to be >= x.
shape1	positive shape parameter 1 of the Beta prior.
shape2	positive shape parameter 2 of the Beta prior.
log	logical; if TRUE, densities are returned on the log scale.
n	number of random values to return (for rbetabinom).

Details

This implementation of dbetabinom allows for automatic differentiation with RTMB.

Value

dbetabinom gives the density and rbetabinom generates random samples.

Examples

set.seed(123)
x <- rbetabinom(1, 10, 2, 5)
d <- dbetabinom(x, 10, 2, 5)

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