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<br /> <br />11 <br /> <br />Figure 2: Racial Isolation Index Values for Pleasanton Compared to Other Bay Are a <br />Jurisdictions (2020) <br />Universe: Bay Area Jurisdictions. <br />Source: IPUMS National Historical Geographic Information System (NHGIS). U.S. Census Bureau, 2020 Census State Redistricting <br />Data (Public Law 94-171) Summary File, 2020 Census of Population and Housing, Table P002. <br />Another way to measure segregation is by using a dissimilarity index: <br />• This index measures how evenly any two groups are distributed across neighborhoods relative <br />to their representation in a city overall. The dissimilarity index at the jurisdiction level can be <br />interpreted as the share of one group that would have to move neighborhoods to create perfect <br />integration for these two groups. <br />• The dissimilarity index ranges from 0 to 1. Higher values indicate that groups are more <br />unevenly distributed (e.g. they tend to live in different neighborhoods).