rdirichlet: Dirichlet deviates

In mixstock: functions for mixed stock analysis

Description

Produces random deviates for the Dirichlet distribution, the multivariate analogue of the beta distribution.

Usage

rdirichlet(n, alpha)

Arguments

n	Number of random deviates to generate.
alpha	Vector of shape parameters.

Details

The Dirichlet distribution is a multivariate distribution that describes distributions of frequencies. If a multinomial sample n_1, … n_N is taken from a population, the estimated distribution of frequencies is Dirichlet(n_1+1, … n_2+N). If \{g_i\} is a set of Gamma deviates with shape parameters \{α_i\}, then \{g_i\}/sum(\{g_i\}) is a Dirichlet deviate.

Value

A matrix of random deviates (each in a distinct row) from rdirichlet

Author(s)

Ben Bolker

Examples

  rdirichlet(5,c(7,4,4))
 

mixstock documentation built on May 2, 2019, 6:48 p.m.