Rank mobility index

In demographics, the rank mobility index (RMI) is a measure of a city's change in population rank among a group of cities.^[1]^[2]

Formally

R M I = \frac{R_{1} - R_{2}}{R_{1} + R_{2}},

where

A RMI value must be between −1 and 1. A RMI of 0 indicates no change.^[3]^[4]

References

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