Rank mobility index
From Wikipedia, the free encyclopedia
In economic geography, the rank mobility index (RMI) is a measure of a city's change in population rank among a group of cities.
Formally
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.
