Hi Everyone:
I asked Andy Pickard from the Hampton
Roads MPO and Kristen Rohanna from SANDAG to look at 2006 ACS, because their
regions have substantial Group Quarters populations (military). For
single year ACS reporting, the threshold of 65,000 population must be reached
before tabulation.
What did they find? I am
attaching 3 documents: one from Andy, one from Kristen and one from me
(US Total)
To estimate the workers in Group Quarters
by Means of Transportation to Work, you can use B08006 Sex by Means of
Transportation to work (all workers) and subtract B08141 Means of
Transportation to work by Vehicles Available (workers in households since
Vehicles Available is a household variable). (Please keep in mind
that the 2006 ACS is the FIRST year that Group Quarters were surveyed and the
sample is small.)
Based on previous data, we would expect to
see MORE walk to work for workers in group quarters. However, many
respondents in Group Quarters are showing up as “worked at
home”. My guess is that this is an artifact of different question
wording on the Group Quarters ACS questionnaire Q26 that says “worked AT
THIS ADDRESS” rather than “worked AT HOME”. So,
the category “worked at home” is “worked at home” (for
households) plus “worked at this address” (for group
quarters).
For the Census 2000 Military form Q21 used
the SAME PHRASE “worked at home” as the housing unit questionnaire.
http://www.census.gov/dmd/www/pdf/d21.pdf
So, let’s say I live and work at
If you have done other work using the 2006
ACS, please share your results with the CTPP listserv. Thanks!
Elaine Murakami
FHWA Office of Planning
206-220-4460
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I did some
analysis of the 2006 ACS data, with and without Group Quarters. Like Andy, we
are finding an increase of those who walk to work with the inclusion of GQs.
Additionally, “drove alone” is much higher when you don’t include
GQs. The change between 2005 and 2006 is significant for those that “drove
alone” to work, UNTIL you use the household workers in 2006; then, the
change is not significant.
I’ve
attached a spreadsheet with my calculations. The “analysis”
worksheet explains what I found….
I hope this helps! Please let me know if you need anything else.
Kristen Rohanna
Associate Research
Analyst
From: Andrew PICKARD
[mailto:apickard@hrpdcva.gov]
Sent: Wednesday, October 31, 2007
2:00 PM
To: Murakami, Elaine
Cc:
Subject: Re: 2006 ACS data with
group quarters
Elaine -
Attached is a pdf w/ some comparisons for you. The
first page I just created and is a quick look at our MSA and the city of
Norfolk, which has ~10% of its population in group quarters [I would have
included a summary for Williamsburg as well (which has about 5k gq pop of 12k
total pop in 2000 Census) but they aren't included in ACS reports yet].
The second page is an analysis I presented to a CTPP/ACS/NHTS workshop that
VDOT, Ed, and Nanda put together last May in northern
A couple general observations:
- drove alone increased about 2% region-wide and
possibly up to ~10% in Norfolk w/out gq pop
- bike or walk decreased over 1% region-wide w/out gq
pop
- travel time to work increased by 0.3 minutes w/out
gq pop
- the number of walkers about cut in half w/out gq
pop
- pub transit decreased about 5k w/out gq pop
- work at home is much higher in 2006 ACS region-wide
and for