Residential housing pattern measures are computed using decennial census data and are therefore released only after each decennial census. Residential housing pattern measures are not released more frequently because the various measures available here use geographic areas as small as census tracts or blocks as the unit of analysis. Only the decennial census can provide data at this small a geographic level. Once the American Community Survey is fully implemented and census tract data become available on a yearly basis (using multi-year averages), then residential housing patterns could be computed on an annual basis instead of every 10 years.
Indexes of housing patterns (also called
segregation indexes) for metropolitan areas (as defined on June 30, 1999) were calculated using data from the
1980 and 1990 Summary Tape File (STF) 1A, and Census 2000 Summary File (SF) 1.
Metropolitan area indexes are based on Metropolitan Statistical Areas (MSAs) and
Primary Statistical Areas (PMSAs) as defined by the Office of Management and Budget
on June 30, 1999. Minor Civil Division-based MSAs and PMSAs were used in New England.
Core-Based Statistical Areas (CBSA), which were defined by OMB on June 6, 2003, include metropolitan
and micropolitan statistical areas.
Metropolitan and micropolitan areas defined on June 6, 2003 are calculated
using Census 2000 data. Metropolitan areas consisting of metropolitan divisions were excluded from our calculations,
but metropolitan divisions were included.
Only micropolitan areas with at least 10 census tracts, and a minority population of at least 100 for the group in
question were considered.
Place index scores were calculated using Census 2000 Summary File (SF) 1.
Only places with 10 or more tracts, a total population of 10,000 or more and a minority
population of at least 100 for the group in question
were considered. Places, also called cities and towns,
include census designated places, consolidated cities, and incorporated places (view the
Geography Glossary (PDF -- 420k) for
more information on the definition of places and/or MSA/PMSAs as defined on June 30, 1999).
Indexes for metropolitan areas, micropolitan areas, or places with small minority populations are less
reliable than those with larger ones. Random factors and geocoding errors are more likely to play a
large role in determining the settlement pattern of group members when fewer members are present,
causing these indexes to contain greater variability. Unless otherwise indicated, indexes were
calculated using Non-Hispanic Whites as the reference group.
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Contact the Census Call Center Staff at 1-800-923-8282 (toll free) or visit
ask.census.gov for further information on Housing Patterns Data.
Source: U.S. Census Bureau, Housing and Household Economic Statistics Division
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