Block Group

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Block Group

A location used by the U.S. Census Bureau where approximately 800 to 1,000 people live. As the name indicates, a block group is usually a collection of city blocks. It is a subdivision of a census tract and is the smallest geographical unit for which the Census reports data.
References in periodicals archive ?
They used water quality monitoring data sets to estimate nitrate levels in CWSs, and source location and census block group data to estimate customer demographics.
Census Block Group data, for any location in United States within an hour of opening the package.
METHODS: We used water quality monitoring data sets (1999-2001) to estimate nitrate levels in CWSs, and source location and census block group data to estimate customer demographics.
Specifically, we used the simulated health data at census block group level (derived from county-specific health data and census information on demographics) to evaluate different strategies for demonstrating impacts of relatively small changes in ambient pollution (compared to [NO.
The coordinates of two solid waste facilities that could not be visually located were assigned to the centroid coordinates of the census block group that contained the road listed as the facility address.
Instead, they relied on census block group data, which reflects some homogeneity of socioeconomic conditions, but doesn't capture individual variations.
Census Bureau 2002) block group characteristics for the census block group where they were located.
Census data and population growth models to estimate age-adjusted standardized incidence ratios annually by census block group (Silent Spring Institute 1997).
We assigned census block group designations to cases based on the geocoded location of residence at the time of diagnosis.
In addition, the project is carried out at four geographic levels of resolution (ZIP code, census tract, census block group, and census block) to assess the importance of geographic resolution in analyzing air toxics emissions.
The researchers used GIS to geocode the study population, develop input data for the simulation model, and assign individual exposure to TCE by linking results of the model to the census block group of residence (Figure 4).
In alternative models, we additionally adjusted for two group-level variables: census block group median annual household income from the 2006-2010 American Community Survey (U.