Concentration at the Extremes (ICE) provides a sub-county measure of segregation that produces scores per feature from -1 (total segregation of the marginalized group) to 1 (total segregation of the privileged group). Formula: ICEi = (Ai - Pi )/Ti Where: Ai = Privileged [white] Pi = Marginalized [Black] Ti = Total Population Massey, Douglas. 2001. “The prodigal paradigm returns: ecology comes back to sociology.” Pp. 41-48 in Does It Take a Village? Community Effects on Children, Adolescents, and Families, edited by A. Booth and A. Crouter. Mahwah, NJ: Lawrence Erlbaum Associates. Krieger, Nancy, et al. 2017. "Measures of local segregation for monitoring health inequities by local health departments." American Journal of Public Health 107(6): 903-906.