Using Data

Comparing ACS data from year to year

Now that 2007-2011 ACS 5 year data is available in the API, please see this guidance on comparing ACS data.

 

http://www.census.gov/acs/www/guidance_for_data_users/comparing_data/

 

From the page:

 

The Census Bureau recommends that you:

 

DO compare estimates from non-overlapping periods, for example, compare a 2005-2007 ACS 3-year estimate to a 2008-2010 ACS 3-year estimate.

 

DON'T compare overlapping periods, for example, the 2005-2007 ACS 3-year estimates to the 2006-2008 ACS 3-year estimates.

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