Rank mobility index

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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

RMI=R1−R2R1+R2,

where

  • R1 = city's rank at time 1
  • R2 = city's rank at time 2

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

References

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