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July 04, 2010

ACS: Sample Size, Accuracy, Quality, Comparisons

Sample Size
The sample sizes for all published counties and county equivalents starting with the 2007 ACS will only be available in the B98* series of Detailed Tables on American FactFinder (AFF).

Sample size information for years prior to 2007 will remain on the ACS website and will not be added to AFF.

Accuracy of the Data
These documents provide data users with a basic understanding of the sample design, estimation methodology, and accuracy of the data.

Also note that there is a direct link to the Design and Methodology report (http://www.census.gov/acs/www/Downloads/survey_methodology/acs_design_methodology.pdf)

Quality of the Data
These quality measures are produced annually to accompany each ACS data release and describe the quality of those data. The quality measures are available at national and state levels. Clicking on "definitions" will provide additional information on each of these measures, including why the measure is important and how it was calculated.

Guidance on Comparing ACS data to Other Sources
The Census Bureau encourages users to compare ACS data with data from other sources. Guidance is needed before drawing conclusions because in some instances comparisons could be misleading due to differences in questions or methods. This page provides three forms of guidance - general guidance, item-specific guidance, and examples. For all comparisons of differing time periods, users should take into consideration that geographic boundaries for the area of interest may have changed

Posted by lisan at July 4, 2010 09:14 AM


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