Questions tagged [index-of-dispersion]

For questions relating to the index of dispersion, or the variance-to-mean ratio for a random variable or stochastic process.

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Does dispersion really matter?

Context: Given a counting process $\{N(t),\,t\ge 0\}$ which tracks the number of events (arrivals) by time $t$, the index of dispersion (for counts) is the variance-to-mean ratio of the cumulative ...