beta.binomial {BAS}R Documentation

Beta-Binomial Prior Distribution for Models

Description

Creates an object representing the prior distribution on models for BAS.

Usage

beta.binomial(alpha=1.0, beta=1.0)

Arguments

alpha parameter in the beta prior distribution
beta parameter in the beta prior distribution

Details

The beta-binomial distribution on model size is obtained by assigning each variable inclusion indicator independent Bernoulli distributions with probability w, and then giving w a beta(alpha,beta) distribution. Marginalizing over w leads to the distribution on model size having the beta-binomial distribution. The default hyperparaeters lead to a uniform distribution over model size.

Value

returns an object of class "prior", with the family and hyerparameters.

Author(s)

Merlise Clyde

See Also

bas.lm, Bernoulli,uniform

Examples

beta.binomial(1,10)

[Package BAS version 0.45 Index]