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College of Arts & Sciences
Hazards & Vulnerability Research Institute


Improvements in the SoVI® Formulation for 2006-10 and 2010-14

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.  These were amended to facilitate downscaling from county to tract levels of geography (e.g. 29 used at the county level, 27 - HOSPTPC and QNOHLTH omitted - at the tract level). There have been no modifications of variables for 2010-14.

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:  Thirty-two original SoVI® variables and descriptions used in SoVI® 2000 

VARIABLE

DESCRIPTION

QASIAN

Percent Asian

QBLACK

Percent Black

QSPANISH

Percent Hispanic

QINDIAN

Percent Native American

QKIDS

Percent Kids

QPOP65O

Percent of Population over 65

MEDAGE

Median Age

QSSBEN

Percent Social Security Beneficiaries

QPOVTY

Percent Poverty

QRICH

Percent Households Earning over $100,000 annually

PERCAP

Per Capita Income

QMIGRA

Percent of Foreign Born who are Recent Migrants

QFEMALE

Percent Female

QFHH

Percent Female Headed Households

NRRESPC

Nursing Home Residents Per Capita

HOSPTPC

Hospitals Per Capita

PHYSICN

Number of Physicians Per 10,000 People

QED12LES

Percent with Less than 12th Grade Education

QCVLBR

Percent in Civilian Labor Force

QCVLUN

Percent Civilian Unemployment

QURBAN

Percent Urban Population

QFRM

Percent of Population on Rural Farms

PPUNIT

People per Unit

QRENTER

Percent Renters

HODENT

Housing Density

MHSEVL

Mean Housing Value

MCRENT

Mean Contract Rent

QMOHO

Percent Mobile Homes

QAGRI

Percent Employment in Extractive Industries

QSERV

Percent Employment in Service Industry

QTRAN

Percent Employment in Transportation & Public Utilities

QFEMLBR

Percent Female Participation in Labor Force

  

Table 2:  List of modifications and omissions from SoVI®2000 to SoVI®2006-10 

VARIABLE

MODIFICATIONS SOVI®2006-10

QASIAN

 

QBLACK

 

QSPANISH

Renamed QHISP

QINDIAN

Renamed QNATAM

QKIDS

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

QPOP65O

Omitted and replaced by QAGEDEP

MEDAGE

 

QSSBEN

Percent of Households Receiving Social Security Benefits (formerly individuals)

QPOVTY

 

QRICH

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

PERCAP

 

QMIGRA

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

QFEMALE

 

QFHH

 

NRRESPC

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

HOSPTPC

Omitted at Block Group and Tract Levels

PHYSICN

Omitted

QED12LES

 

QCVLBR

Omitted

QCVLUN

 

QURBAN

Omitted

QFRM

Omitted

PPUNIT

 

QRENTER

 

HODENT

Omitted

MHSEVL

Omitted and replaced by MDHSEVAL (Median house value)

MCRENT

Omitted and replaced by MDGRENT (Median gross rent)

QMOHO

 

QAGRI

Renamed QEXTRCT

QSERV

 

QTRAN

Omitted

QFEMLBR

 

 

Table 3 List of SoVI® 2006-10 Variables (n=29).  Daggers notate new variables added. 

 

VARIABLE

 

DESCRIPTION

QASIAN

Percent Asian

QBLACK

Percent Black

QSPANISH

Percent Hispanic

QINDIAN

Percent Native American

QAGEDEP

Percent Population under 5 years or 65 and over

QFAM

Percent of Population over 65

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