# Probability distribution function

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Depending upon which text is consulted, a **probability distribution function** is any of:

- a probability distribution function,
- a cumulative distribution function,
- a probability mass function, or
- a probability density function.

The similar term **probability function** may mean any of the above and, in addition,

- a probability measure function, as in a probability space, where the domain of the function is the set of events.