By: Mike Johnson Jr
Date Created: April 30, 2019, 3:15 a.m.

The diversity ratio in this study is based on the Simpson's Diversity Index, where we rank each county on the probability of randomly selecting two people and getting two people of different races (ecological entropy): D =1 - ∑(n/N)2 where n = number of people of a given race and N is the total number of people of all races. Data source: