Both the Index of Dissimilarity and Interaction Index can only measure the segregation of two groups compared to each other. The Multi-Group Entropy Index measures the distribution of multiple groups simultaneously. This measure is dependent on the number of categories included in the computation. Multi-Group Entropy Indices at the census tract were derived using the following categories: Non-Hipanic White, Non-Hispanic Black, Non-Hispanic Asian, Hispanic.
Three measures are available as of this release: Multi-Group Entropy Scores at the census tract and metro-level, and a Multi-Group Entropy Index that standardizes the sum of the census-tract scores within a metro by the standard deviation of the metro-level distribution. For more information see technical documentation https://www2.census.gov/programs-surveys/demo/about/housing-patterns/multigroup_entropy.pdf.