Why do some Semantic Index terms have very few “live use cases”?

The number of sentences appearing in the live use-cases dialog is not indicative of a term's statistical importance.

Because live use cases are intended to show contextual usage of a term, only complete sentences are chosen for live use cases. Many terms -- particularly on shopping or video sites -- may appear on a page but not be part of a complete sentence. Hence, it is possible for a term to appear on dozens of pages, but only appear on 2 or 3 complete sentences.

Secondly, a term's weight (importance) is determined through a much more complex set of calculations than simply the number of pages (or number of complete sentences) in which it appears.

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