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2016 overall SVI, county level. Created by the Centers for Disease Control and Prevention (CDC) / Agency for Toxic Substances and Disease Registry (ATSDR) / Geospatial Research, Analysis, and Services Program (GRASP). A brief summary of the item is not available. Add a brief summary about the item.

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Item created: Mar 28, 2018 Item updated: May 3, 2018 View count: 0

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Description

  • This feature layer visualizes the 2016 overall SVI for U.S. counties
  • Social Vulnerability Index (SVI) indicates the relative vulnerability of every U.S. county

  • 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's 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. The SVI ranks each county 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 2016 SVI documentation.

Rankings
We ranked counties 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. County rankings are based on percentiles. Percentile ranking values range from 0 to 1, with higher values indicating greater vulnerability. For each county, we generated its percentile rank among all counties for 1) the fifteen individual variables, 2) the four themes, and 3) Its overall position. 

Overall Rankings:
We summed 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

Flags
Counties in the top 10%, i.e., at the 90th percentile of values, are given a value of 1 to indicate high vulnerability.  Counties below the 90th percentile are given a value of 0.  For a theme, the flag value is the number of flags for variables comprising the theme. We calculated the overall flag value for each county as the number of all variable flags. 

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Terms of Use

These data are available to the public at large with no constraints or limitations. If used, please reference the Centers for Disease Control and Prevention/ Agency for Toxic Substances and Disease Registry/ Geospatial Research, Analysis, and Services Program. For more information please see the SVI website or contact the SVI Coordinator.

No special restrictions or limitations on using the item's content have been provided.

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          Applicable: 2d

          Data updated: Mar 4, 2019, 7:05 PM

          Schema updated: Jan 28, 2025, 8:10 PM

          Size: 24.313 MB

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          ID: 425652f366d34c8ca33e6b014a304054

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          Centers for Disease Control and Prevention Managed by:
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          CDC, SVI, Social Vulnerability Index, Social Vulnerability, Overall, County, Population, housing, demographics, poverty, at risk, income, people

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          Centers for Disease Control and Prevention (CDC) / Agency for Toxic Substances and Disease Registry (ATSDR) / Geospatial Research, Analysis, and Services Program (GRASP)

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