Catalog of Holdings

Study Report

Study Number: AC-026-001-2-1-United States-GeoLytics-1970

Subject Area: County

Bibliographic Citation: CensusCD neighborhood change database (NCDB): tract level census data, 1970-2000.  [machine-readable data file] / U.S. Department of Commerce. Bureau of the Census  [principal investigator(s)] / Ease Brunswick, NJ: GeoLytics Inc.  [distributor].

Originating Archive Number: CCD40

Date Accessioned: 1/22/2003

Number of Files Received: 0

Comments: CensusCD 40 years, short form release. 10/03 The user interface program was installed to C:\NCDB on Peppermint and Spearmint. The Guest account permission is set to Change. For additional information about this product visit Geolytics web site. This product is tract level only product. In order to sum up a larger geographic level, users need to run the tract level data out as an ASCII or DBF file and then use Excel, SAS or other software to aggregate the data to county or state level. Please note the 1970 and 1980 data is not fully tracted on this CD. That means if users sum all of the tracts up for 1970 and 1980, users will not necessarily get the correct county or state level numbers if there are sections that are not yet tracted. (See PDR folder for Katia's email for more information.) 9/06 Program is installed on Ketchup and Mustard. 7/09 Beer and Wine replaced Ketchup and Mustard. 5/14 An ISO image was created on the network drive for this CD-Rom. 8/16 A write counts error can be ignored as the report and counts can be written on C:\Data\NCDB directory.

Access Status: Access limited to UW Campus

Date Ordered: 9/15/2002

Documentation: One volume hard copy user's guide and online help. Variables for each census can be viewed in the following links: 1970 variables, 1980 variables, 1990 variables and 2000 variables.

Abstract: The Neighborhood Change Database (NCDB) is based on the geographic unit of the Census Tract. The Census Tract is the Census Bureau's statistical equivalent of a large neighborhood (with an average of about 4,000 people). GeoLytics developed this product in association with the Urban Institute and partially funded by Rockefeller Foundation. It is the only source of census data with variables and tract boundaries that are consistently defined across census years. The current Short Form Release includes Census 2000 "short form" data -- basic population and housing characteristics from the short form questions answered by all households in the decennial censuses. Users can access the data for 1970, 1980, 1990, or 2000 in the respective tract boundary definitions for that year. In this manner, the data will appear as it did for the given year and the maps will be drawn according to that year's boundaries. In this format the data will be identical to that found in the CensusCD product for that given year. With Neighborhood Change Database, however, users can access data for all four decades normalized to 2000 tract boundaries. The All years normalized to 2000 selection allows users to compare data for various years. The data for years 1970-1990 will be recalculated and normalized and the report will use the 2000 tract ID. This will allow users to compare data for various years within the exact same boundary definitions. The data in CensusCD Neighborhood Change Database are constructed from select variables from the U.S. Census Long Form tract-level tabulations for 1970, 1980, and 1990. The 2000 data included at this time are from the Short Form, which does not include information such as income, education, housing value, or commuting time. These variables will only be on the 1970, 1980 and 1990 data sets. All of the data are available at the tract level only. In 1970 and 1980, only some areas of the U.S. were covered by tracts and thus the data coverage will be incomplete for those years. Beginning in 1990, the entire U.S. was covered by census tracts. Also 1970 and 1980 have suppressed fields. For those two years, the Census Bureau did not release data if there were fewer than 5-15 people in a geography. The extracted data files can be imported to other systems like statistical (e.g. SAS, SPSS), database (e.g. Access, Oracle), spreadsheet (e.g. Excel, 1-2-3), or mapping (e.g. Arc View, MapInfo) packages.

Media/File Reports:

7292 (CD-ROM)
7293 (CD-ROM)
6026 (CD-ROM)
6027 (CD-ROM)