Rank mobility index
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
A RMI value must be between −1 and 1. A RMI of 0 indicates no change.
Economic geography
Economic geography is the study of the location, distribution and spatial organization of economic activities across the world. The subject matter investigated is strongly influenced by the researcher's methodological approach. Neoclassical location theorists, following in the tradition of Alfred...
, the rank mobility index (RMI) is a measure of a city
City
A city is a relatively large and permanent settlement. Although there is no agreement on how a city is distinguished from a town within general English language meanings, many cities have a particular administrative, legal, or historical status based on local law.For example, in the U.S...
'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.