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This tag is very ambiguous. Dispersion is a general term for how spread apart values are. For questions related to disease dissemination content, use the tag epidemiology. For other meanings of dispersion consider using a related tag or creating a new one.

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5 answers
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How to measure dispersion in word frequency data?

How can I quantify the amount of dispersion in a vector of word counts? … More generally, how does one measure the dispersion or "spread" in nominal data? Is there a standard way of doing this in the text analysis community? …
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