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2000 to 2007-2009 to 2010-2012: Changes in Transit, Walk and Bike Commute Shares

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Because the ACS is a different survey, compared to the Census 2000 "long form," the results are not exactly comparable. Because trend analysis is important, we have developed these spreadsheets to give transportation planners a handy way to examine trends by  looking at the differences between Census 2000 results, and the 2007-2009 and the 2010-2012 ACS.

For these spreadsheets, the change between the Census 2000 and the 2007-2009 ACS are used to determine the ranking of the areas with the most changes.  Then, the 2010-2012 ACS results are added for those areas. 

Differences to remember:

  1. The 2007-2009 ACS and the 2010-2012 ACS are compilations of 36 months of surveys,  and not a "point in time" like the decennial census.
  2. Because the ACS covers all 12 months of the year, areas with seasonal population shifts, e.g. snowbirds, summer homes, and universities are likely to see the more differences than in other locations and reflect both the change is time, as well as change in survey methods.
  3. ACS 3-year survey sample is much smaller than the Census 2000 long form, therefore the Margins of Error (MOE) are much larger.
Updated: 7/16/2014
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