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<br /> <br />5 <br />segregation for a single group, while the dissimilarity index measures segregation between two groups. <br />The Theil’s H-Index can be used to measure segregation between all racial or income groups across the <br />city at once. HCD’s AFFH guidelines require local jurisdictions to include isolation indices and <br />dissimilarity indices in the Housing Element. Theil’s H index is provided in addition to these required <br />measures. For segregation between cities within the Bay Area (inter-city segregation), this report <br />includes dissimilarity indices at the regional level as required by HCD’s AFFH guidelines. HCD’s A FFH <br />guidelines also require jurisdictions to compare conditions at the local level to the rest of the region; <br />and this report presents the difference in the racial and income composition of a jurisdiction relative <br />to the region as a whole to satisfy the comparison requirement. <br />1.2 Defining Segregation <br />Segregation is the separation of different demographic groups into different geographic locations or <br />communities, meaning that groups are unevenly distributed across geographic space. This report <br />examines two spatial forms of segregation: neighborhood level segregation within a local jurisdiction <br />and city level segregation between jurisdictions in the Bay Area. <br />Neighborhood level segregation (within a jurisdiction, or intra-city): Segregation of race and income <br />groups can occur from neighborhood to neighborhood within a city. For example, if a local jurisdiction <br />has a population that is 20% Latinx, but some neighborhoods are 80% Latinx while others have nearly no <br />Latinx residents, that jurisdiction would have segregated neighborhoods. <br />City level segregation (between jurisdictions in a region, or inter-city): Race and income divides also <br />occur between jurisdictions in a region. A region could be very diverse with equal numbers of white, <br />Asian, Black, and Latinx residents, but the region could also be highly segregated with each city <br />comprised solely of one racial group. <br />There are many factors that have contributed to the generation and maintenance of segregation. <br />Historically, racial segregation stemmed from explicit discrimination against people of color, such as <br />restrictive covenants, redlining, and discrimination in mortgage lending. This history includes many <br />overtly discriminatory policies made by federal, state, and local governments (Rothstein 2017). <br />Segregation patterns are also affected by policies that appear race-neutral, such as land use decisions <br />and the regulation of housing development. <br />Segregation has resulted in vastly unequal access to public goods such as quality schools, neighborhood <br />services and amenities, parks and playgrounds, clean air and water, and public safety (Trounstine <br />2015). This generational lack of access for many communities, particularly people of color and lower <br />income residents, has often resulted in poor life outcomes, including lower educational attainment, <br />higher morbidity rates, and higher mortality rates (Chetty and Hendren 2018, Ananat 2011, Burch 2014, <br />Cutler and Glaeser 1997, Sampson 2012, Sharkey 2013). <br />1.3 Segregation Patterns in the Bay Area <br />Across the San Francisco Bay Area, white residents and above moderate-income residents are <br />significantly more segregated from other racial and income groups (see Appendix 2). The highest levels <br />of racial segregation occur between the Black and white populations. The analysis completed for this <br />report indicates that the amount of racial segregation both within Bay Area cities and across <br />jurisdictions in the region has decreased since the year 2000. This finding is consistent with recent <br />research from the Othering and Belonging Institute at UC Berkeley, which concluded that “[a]lthough 7