A data tool from CSH that measures whether a racial and/or ethnic group’s representation in a particular public system is proportionate to, over or below their representation in the overall population (proportionality) and also allows for the examination of systematic differences between groups and geographies (disparities).

Distinguishing the Racial Disparities and Disproportionality Index (RDDI) from other standard indices is the way it compares racial and ethnic groups:  whereas most other indices use white populations as the baseline comparison group for all other racial and ethnic groups, the RDDI compares each group to the aggregation of all other groups, and in effect de-centers “whiteness” as the standard from which all other groups are measured.

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