Overall SVI - Tracts

This feature layer visualizes the 2018 overall SVI for U.S. counties and tracts Social Vulnerability Index (SVI) indicates the relative vulnerability of every U.S. county and tract 15 social factors grouped into four major themes Index value calculated for each county for the 15 social factors, four major themes, and the overall rank What is CDC Social Vulnerability Index? ATSDR’s Geospatial Research, Analysis & Services Program (GRASP) has created a tool to help emergency response planners and public health officials identify and map the communities that will most likely need support before, during, and after a hazardous event. The Social Vulnerability Index (SVI) uses U.S. Census data to determine the social vulnerability of every county and tract. CDC SVI ranks each county and tract on 15 social factors, including poverty, lack of vehicle access, and crowded housing, and groups them into four related themes: Socioeconomic Housing Composition and Disability Minority Status and Language Housing and Transportation Variables For a detailed description of variable uses, please refer to the full SVI 2018 documentation. Rankings We ranked counties and tracts for the entire United States against one another. This feature layer can be used for mapping and analysis of relative vulnerability of counties in multiple states, or across the U.S. as a whole. Rankings are based on percentiles. Percentile ranking values range from 0 to 1, with higher values indicating greater vulnerability. For each county and tract, we generated its percentile rank among all counties and tracts for 1) the fifteen individual variables, 2) the four themes, and 3) its overall position. Overall Rankings: We totaled the sums for each theme, ordered the counties, and then calculated overall percentile rankings. Please note: taking the sum of the sums for each theme is the same as summing individual variable rankings. The overall tract summary ranking variable is RPL_THEMES. Theme rankings: For each of the four themes, we summed the percentiles for the variables comprising each theme. We ordered the summed percentiles for each theme to determine theme-specific percentile rankings. The four summary theme ranking variables are: Socioeconomic theme - RPL_THEME1 Housing Composition and Disability - RPL_THEME2 Minority Status & Language - RPL_THEME3 Housing & Transportation - RPL_THEME4