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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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Why would someone plot variance normalized by the mean?

I'm used to seeing standard deviation and variance, both of which reflect dispersion. What does plot of variance normalized by the mean give me that plot of variance does not? … edit: This relation is apparently called the "index of dispersion". …