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College of Arts & Sciences
Hazards & Vulnerability Research Institute

Changes and Improvements in the SoVI® Formulation for 2006-10

SoVI® 2006-10 marks a change in the formulation of the SoVI® metric from earlier versions. New directions in the theory and practice of vulnerability science emphasize the constraints of family structure, language barriers, vehicle availability, medical disabilities, and healthcare access in the preparation for and response to disasters, thus necessitating the inclusion of such factors in SoVI®. Extensive testing of earlier conceptualizations of SoVI®, in addition to the introduction of the U.S. Census Bureau’s five-year American Community Survey (ACS) estimates, warrants changes to the SoVI® recipe, resulting in a more robust metric. These changes, pioneered with the ACS-based SoVI® 2005-09 carry over to SoVI® 2006-10, which combines the best data available from both the 2010 U.S. Decennial Census and five-year estimates from the 2006-2010 ACS.

The tables below detail modifications in the base variables used to compute SOVI®. The first of these tables describes the original 32-variable set used in 2000. The second table lists changes to variables when compiling SOVI® 2006-10. The final table gives a complete list of the 29 variables in SOVI® 2006-10 (29 used at the county level, 27 - HOSPTPC and QNOHLTH omitted - at the tract level).

As vulnerability science evolves, no doubt SoVI® will as well. Future directions for SoVI® include the consideration of pets, homeless populations, physical mobility constraints, prescription drug dependence, and social capital all at finer spatial scales.