Table 1.

Measures of Racial Residential Segregation.

Measure	Formula	Interpretation
Dissimilarity Index Score Range: 0 – 1, 1 = high dissimilarity	$Dissimilarity=\frac{1}{2}{\sum }_{i=1}^n\mid \frac{w_i}{W_T}-\frac{b_i}{B_T}\mid$	Score of 0.6 suggests 60% of Black residents of an HRR would need to move to different Zip codes within their HRR of residence in order for blacks and whites to be evenly dispersed in that HRR.
Isolation Index Score Range: 0 – 1, 1= high isolation	$Isolation={\sum }_{i=1}^n\left(\frac{b_i}{B_T}\right)\ast \left(\frac{b_i}{P_T}\right)$	If blacks make up 25% of the population of an HRR, but all blacks live in Zip codes that are 100% black, the isolation index would be equal to 1.
Components	Description
bi	Number of blacks in the Zip code
BT	Number of blacks in the HRR
n	Number of Zip codes
PT	Total population of the HRR
Wi	Number of whites in the Zip code
WT	Number of white in the HRR