Generate Random Variables from a Dirichlet Sampling Model

Description

Generates random variables from a Dirichlet sampling model.

Usage

1
  rvdirichlet(n=1, alpha)

Arguments

n

integer: number of vectors to generate

alpha

the parameter vector; may be random

Details

The Dirichlet distribution is a generalization of the Beta distribution. (If alpha is of length two, rvdirichlet draws from the Beta model.)

Value

A random vector (rv object) of length n.

Author(s)

Jouni Kerman jouni@kerman.com

References

Kerman, J. and Gelman, A. (2007). Manipulating and Summarizing Posterior Simulations Using Random Variable Objects. Statistics and Computing 17:3, 235-244.

See also vignette("rv").

Examples

1
2
  a <- rvdirichlet(1, alpha=c(6, 3, 1)) # 
  sum(a) # one with probability 1

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