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College of Arts & Sciences
Hazards & Vulnerability Research Institute


SoVI® Evolution

 

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 prior testing of SoVI®, along with the introduction of the U.S. Census Bureau’s five-year American Community Survey estimates, permits changes to the SoVI® recipe, resulting in an overall more robust metric.

The tables below detail modifications in the base variables used to compute SOVI®. These tables listed in chronological order describe the current version of SoVI® with its 29 variable set for counties (Table1), and changes from the original 32-variable set used in 2000 (Table 2). 

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.

Table 1 List of SoVI® 2006-10 Variables (n=29).  Daggers notate new variables added.

 

VARIABLE

DESCRIPTION

QASIAN

Percent Asian

QBLACK

Percent Black

QSPANISH

Percent Hispanic

QNATAM

Percent Native American

QAGEDEP

Percent Population under 5 years or 65 and over

QFAM

Percent Children Living in 2-parent families

MEDAGE

Median Age

QSSBEN

Percent Households Receiving Social Security Benefits

QPOVTY

Percent Poverty

QRICH

Percent Households Earning over $200,000 annually

PERCAP

Per Capita Income

QESL

Percent Speaking English as a Second Language with Limited English Proficiency

QFEMALE

Percent Female

QFHH

Percent Female Headed Households

QNRRES

Nursing Home Residents Per Capita

HOSPTPC

Hospitals Per Capita (County Level ONLY)

QNOHLTH

Percent of population without health insurance (County Level ONLY)

QED12LES

Percent with Less than 12th Grade Education

QCVLUN

Percent Civilian Unemployment

PPUNIT

People per Unit

QRENTER

Percent Renters

MDHSEVAL

Median Housing Value

MDGRENT

Median Gross Rent

QMOHO

Percent Mobile Homes

QEXTRCT

Percent Employment in Extractive Industries

QSERV

Percent Employment in Service Industry

QFEMLBR

Percent Female Participation in Labor Force

QNOAUTO

Percent of Housing Units with No Car

QUNOCCHU

Percent Unoccupied Housing Units

Table 2:  Thirty-two original SoVI® variables. descriptions, and changes in SoVI® 2000 

VARIABLE

DESCRIPTION

CHANGES FROM SoVI®2000 TO SoVI®2006-10

QASIAN

Percent Asian

 

QBLACK

Percent Black

 

QSPANISH

Percent Hispanic

Renamed QHISP

QINDIAN

Percent Native American

Renamed QNATAM

QKIDS

Percent Kids

Omitted and replaced by QAGEDEP=Percent of population under 5 years and 65 or older

QPOP65O

Percent of Population over 65

Omitted and replaced by QAGEDEP

MEDAGE

Median Age

 

QSSBEN

Percent Social Security Beneficiaries

Percent of Households Receiving Social Security Benefits (formerly individuals)

QPOVTY

Percent Poverty

 

QRICH

Percent Households Earning over $100,000 annually

Percent of Households Earning over $200,000 (formerly $100,000)

PERCAP

Per Capita Income

 

QMIGRA

Percent of Foreign Born who are Recent Migrants

Omitted and replaced with QESL=Percent Speaking English as a Second Language

QFEMALE

Percent Female

 

QFHH

Percent Female Headed Households

 

NRRESPC

Nursing Home Residents Per Capita

Modified to QNRRES=Percent of Population Living in Nursing and Skilled-Nursing Facilities (formerly computed as per capita)

HOSPTPC

Hospitals Per Capita

Omitted at Block Group and Tract Levels

PHYSICN

Number of Physicians Per 10,000 People

Omitted

QED12LES

Percent with Less than 12th Grade Education

 

QCVLBR

Percent in Civilian Labor Force

Omitted

QCVLUN

Percent Civilian Unemployment

 

QURBAN

Percent Urban Population

Omitted

QFRM

Percent of Population on Rural Farms

Omitted

PPUNIT

People per Unit

 

QRENTER

Percent Renters

 

HODENT

Housing Density

Omitted

MHSEVL

Mean Housing Value

Omitted and replaced by MDHSEVAL (Median house value)

MCRENT

Mean Contract Rent

Omitted and replaced by MDGRENT (Median gross rent)

QMOHO

Percent Mobile Homes

 

QAGRI

Percent Employment in Extractive Industries

Renamed QEXTRCT

QSERV

Percent Employment in Service Industry

 

QTRAN

Percent Employment in Transportation & Public Utilities

Omitted

QFEMLBR

Percent Female Participation in Labor Force