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Neighborhood Analysis Summary & Details Census Tract Demographics Geodemographics WebCourse |
Neighborhood Analysis with CommunityViewer -- analyzing characteristics of neighborhoods: block group demographics This section provides an overview of how the CommunityViewer software can be used for neighborhood analysis using census block group geography (see notes). The following graphic shows a thematic map of median household income by census block group for the Chattanooga, Tennessee area. Chattanooga place appears in next graphic with bold outline. Block groups are shaded by colors for median household income as shown for the data value intervals in the legend panel (at left). At the same time, the SiteAnalysis operation has been used to draw a circle with a 1-mile radius for a location in a neighborhood of interest. 
The number of households by type data are used to examine the number of female householders with no husband present (and by children present). Data are shown for block groups (BGs) partly/wholly located with the 2-mile circle in the panels at the right. In brief summary, there are 10 BGs is the area of analysis and 3,870 households in these 10 BGs. Of these households, there are 966 female householders with no husband present who have own children under 18 years of age (item P0100015). The geocodes are listed below the summary panel. Application Objective. The number and type of incidence of the number of female householders with no husband present with own children under 18 years of age may be of particular interest to community and education agencies and organizations. Children in these households may be 'at-risk.' More data would be required to fully assess this demographic make-up. In this section, only the Summary File 3 Table P10 data are examined. Neighborhood Analysis. In the view shown above, the upper right Site Analysis Summary panel shows that there are 10 BGs included in the 2-mile circle (as indicated by the hand in the graphic). Data are summarized for these 10 BGs for each item in Summary File 3 Table P010 -- Household Size and Type by Presence of Own Children (see items below). The list of BGs that are partly/wholly contained in the 2-mile circle are shown in the listbox at the lower right. The code shown is the 'extended' geographic code, or geocode, which is collective codes for state FIPS, county FIPS, census tract, and BG. The procedure to download and integrate these types of demographics is described in detail in the tutorial Census Tract Demographics. Shorthand table/item names follow nomenclature, such as P010001, used in the summary report follow the Census naming convention. The details of correspondence between the item descriptor and longer description is shown in the Excel file downloaded to the user's computer. The following graphic shows a portion of the Excel file. Item 'P010001' is the shorthand (item descriptor) for 'Households: Total'. 
The data as displayed in FactFinder at the time of download appears below. 
Analysis might start with one particular block group. The Search tool is used to locate BG with P1CODE (geocode) equal to 470650003001. The BG is located and colored yellow (see pointer). 
This BG is profiled using the Identify tool. In the following graphic the BG code (labeled as P1CODE) is shown along with the data values for each table/item cell. 
The Site Analysis operation is started and a circle is drawn so that this BG and adjacent BGs are included. The following graphic shows a zoom-in. BGs have been labeled with the P1CODE. Streets could be added for more location detail. Schools and other points of interest could be added. 
Block Group & Census Tract Geography. Census block groups are the smallest geographic areas for which the 'richer' Census 2000 sample-based data were tabulated. For Census 2000, data were tabulated for 65,443 census tracts and 208,790 block groups in the U.S. A broader set of Census 2000 subject matter were tabulated for census tracts as compared to block groups ('PCT' tables). In addition, census tracts have important properties making this an appealing geographic level for analysis (more stable geography over time, smaller errors in estimates, more widely used by other statistical programs). However, some areas require analysis of geography with a finer granularity that provided by census tracts. Census block groups and census blocks are useful in meeting such needs. goto top |
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