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The quality measures provided in this section illustrate the steps the Census Bureau takes to ensure that ACS survey data are accurate and reliable.
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How large was the sample used to produce the ACS estimates?
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How well does the ACS cover the population?
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What was the response to the survey?
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How complete were the data used to produce a specific estimate?
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The ACS produces survey data each year to measure key social, economic, and housing characteristics about the U.S. population. The four questions above identify four important aspects of survey quality. 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.
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