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Resource Source:Census Bureau
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.Link:
ACS: Comparison Guidance Basic (Source: Census Bureau)
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