Laserfiche WebLink
<br /> <br />14 <br /> <br />Figure 3: Racial Dissimilarity Index Values for Pleasanton Compared to Other Bay Area <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 />Note: The analysis conducted for this report suggests that dissimilarity index values are unreliable for a population group if <br />that group represents approximately less than 5% of the jurisdiction’s total population. ABAG/MTC recommends that when <br />cities have population groups that are less than 5% of the jurisdiction’s population (see Table 4), jurisdiction staff could focus <br />on the isolation index or Thiel’s H-Index to gain a more accurate understanding of neighborhood-level racial segregation in their <br />jurisdiction. <br />The Theil’s H Index can be used to measure segregation between all groups within a jurisdiction: <br />• This index measures how diverse each neighborhood is compared to the diversity of the whole <br />city. Neighborhoods are weighted by their size, so that larger neighborhoods play a more <br />significant role in determining the total measure of segregation. <br />• The index ranges from 0 to 1. A Theil’s H Index value of 0 would mean all neighborhoods within <br />a city have the same demographics as the whole city. A value of 1 would mean each group lives <br />exclusively in their own, separate neighborhood. <br />• For jurisdictions with a high degree of diversity (multiple racial groups comprise more than 10% <br />of the population), Theil’s H offers the clearest summary of overall segregation. <br />The Theil’s H Index values for neighborhood racial segregation in Pleasanton for the years 2000, 2010, <br />and 2020 can be found in Table 3 below. The “Bay Area Average” column in the table provides the <br />average Theil’s H Index across Bay Area jurisdictions in 2020. Between 2010 and 2020, the Theil’s H <br />Index for racial segregation in Pleasanton stayed the same, suggesting that there is now about the <br />same amount of neighborhood level racial segregation within the jurisdiction. In 2020, the Theil’s H <br />Index for racial segregation in Pleasanton was lower than the average value for Bay Area jurisdictions,