| Census > ACS Main > About the Data (Methodology) Main > ACS 1999-2001 and Census 2000 Comparison Study |
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Online DataChoose county to access online data at county and tract level.
The links above provide access to "County Index" pages. County index pages provide links to online data profiles, and quality measures data tables for each of the 36 ACS test counties. The data profiles for this comparison project are similar to the standard ACS single-year profiles, and to the Census 2000 Demographic Profiles. However, these profile tables contain only those lines that were directly comparable between the ACS and Census 2000 profiles.1 The four comparison profile tables (demographic, social, economic, and housing characteristics) are available for all counties. Profile tables are also provided for tracts that contained sampled units in all three years for all counties except Fort Bend and Harris. The ACS Test sampling rate was too low in those counties to provide enough data for reliable estimates at the tract level. However, profile tables for collections of tracts (called User-Defined Areas, or UDAs) can be downloaded from the Comparison Study ftp server. Please review the information in Downloads/FTP Server to learn how that material is organized. Each of the profiles contain the 3-year average ACS estimate, the Census 2000 estimate, these estimates as percentages where appropriate, the difference between the estimates or estimated percentages, the margin of error of the difference, and a yes/no indicator of whether the change was statistically significant at the 90% confidence level. Data for ACS Quality Measures are also available as online tables for all 36 counties. Downloadable Quality Measures data are available at the tract level for all counties except Fort Bend and Harris. Further information about these data sets can be found in the technical documentation on the ftp server. 1The group quarters population was removed from the Census 2000 sample profile data since the ACS did not include samples of this population. |
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