Rank mobility index
From HandWiki
In demographics, the rank mobility index (RMI) is a measure of a city's change in population rank among a group of cities.
Formally
- [math]\displaystyle{ RMI=\frac{R_1-R_2}{R_1+R_2}, }[/math]
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.
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