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Heaps’ law gives the vocabulary size in collections.
We also study the relative frequencies of terms.
In natural language, there are a few very frequent terms and very many very rare terms.
Zipf’s law: The ith most frequent term has frequency proportional to 1/i .
cfi ∝ 1/i = K/i where K is a normalizing constant
cfi is collection frequency: the number of occurrences of the term ti in the collection.
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