# Polya Urn Scheme

**Parent**: Stochastic Processes

The Polya urn scheme is intuitively described as an urn filled with balls
that are each one of two colors (e.g. black or white). A ball is sampled,
its color recorded, and the ball plus another ball of the sampled ball’s color is
placed back in the urn. A sample from this stochastic process is the
sequence of colors of balls.

## Relation to Other Processes

### Blackwell MacQueen Urn Scheme

The Blackwell MacQueen Urn Scheme
generalized the Polya urn scheme to an infinite number of colors.

### Chinese Restaurant Process

### Dirichlet Process