Because , thus this city has zero segregation. As another example, suppose you have a city with 3 blocks: Then, we have rich people in our city, and poor people. Thus: Again, because , thus this city also has zero segregation. See also Kullback–Leibler divergence Isolation index self-dissimilarity Hoover index References External links http://enceladus.isr.umich.edu/race/calculate.html Index numbers