Dyadic distribution

A dyadic (or 2-adic) distribution is a specific type of discrete probability distribution that is of some theoretical importance in data compression.

Definition

A dyadic distribution is a probability distribution whose probability mass function is

$f(i)=2^{-x_{i}}$

where $x_{i}$ is some whole number.

It is possible to find a binary code defined on this distribution, which has an average code length that is equal to the entropy.

References

• Cover, T.M., Joy A. Thomas, J.A. (2006) Elements of information theory, Wiley. ISBN 0-471-24195-4