That's a good report Michael. I especially like seeing recommendation
4-9 which states, "The Census Bureau should undertake research to
develop confidentiality protection rules and procedures for tabulations
from the ACS that recognize the protection afforded to respondents by
pooling the data over many months. Whenever possible, the Census Bureau
should prefer confidentiality protection procedures that preserve the
ability to aggregate smaller geographic areas into larger, user defined
According to my read when dealing with 5 and 3-year data accumulations
it says that given the fact that the ACS is collecting surveys from
different people over many months and the fact that peoples'
characteristics continually change over time, that alone might be all
the confidentiality protection that is needed.
Michael Cline wrote:
Also search, American Community Survey at the
(National Research Council) and there is an online book published this
year that reviews ACS and related issues.
Title: Using the American Community Survey:Benefits and Challenges
Michael E. Cline
Institute for Demographic & Socioeconomic Research
The University of Texas at San Antonio
1 UTSA Circle
San Antonio, TX 78249-0704
[mailto:firstname.lastname@example.org] On Behalf Of Murakami, Elaine
Sent: Thursday, September 13, 2007 12:32 PM
To: ctpp-news maillist
Subject: [CTPP] Useful links to training on using ACS data
Now that the Census Bureau is busy releasing the 2006 ACS data, I
thought it would be timely to post a few links on using the ACS data.
It is VERY IMPORTANT to understand that the biggest difference between
the 2006 and 2005 ACS is that GROUP QUARTERS population was ADDED in
the 2006 sample. Areas with large Group Quarters population will see
the greatest differences between 2006 and 2005 results. Workers who
live in Group Quarters are more likely to walk to work, so you may see
shifts in distributions of means of transportation to work in these
areas. The population threshold for reporting 1-year ACS data is
still 65,000 persons, based on place of residence. The 2005 and 2006
ACS standard tabulation include tabulations for PLACE OF WORK called
for workplace geography. Also, the key to finding tables on
journey to work is 08, for example: B08###, or C08###, or S08##.
Cynthia Taeubers book, American Community Survey data in Community
Planning (Trafford Publishing, 2006 website:
) is an easy-to-understand document that covers
basic information about ACS, but most importantly, understanding
sampling error and confidence intervals. Note: The Census Bureau is
now using the term Margin of Error to reflect sampling error
instead of using confidence intervals (the estimate with an upper and
You can order it directly from Trafford.com
, which is a print on
demand publishing house, but I just found it on Amazon.
(priced at $26.37 and listed as in stock )
Also, Cynthias material completed for Brookings Institute for
journalists is on-line at:
This document on the Census Bureaus webpage discussing the 2005 ACS
is also useful.
The FHWA page also includes some material on using ACS data, which was
developed for earlier releases of ACS, but are still relevant.
Because we prepared profiles sheets from the 2005 ACS data, with
comparison to Census 2000, we are currently NOT planning to issue NEW
profiles using the 2006 data. We are currently focusing on PLANS for
the NEXT CTPP, using the first 3 year accumulation of ACS data (2005,
2006, and 2007), and conducting research on 1) improving workplace
imputation for ungeocoded survey responses, and 2) alternative
approaches to disclosure avoidance, to avoid the data suppression
problems that arose in the CTPP2000.
If you have ideas for the 3-year CTPP product, especially NEW or
DIFFERENT Tables, please let me know!
FHWA Office of Planning
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