# Frequency Function

A Frequency Function is a multiset function that ranks each multiset member.

**Context:****range:**Multiset Frequency Value.- It can range from being an Empirical Frequency Function to being an Analytical Frequency Function (such as a expected frequency).
- It can range from being an Absolute Frequency Function to being a Relative Frequency Function.
- It can be related to a Frequency Probability Distribution.
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**Example(s):**- a Term Frequency Function.
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**Counter-Example(s):****See:**IDF Function, tf-idf Function.