Bicycles are a distinct mode category on the questionnaire (not lumped in with cars or
trucks), so my guess is either the respondent did not understand the question and answered
incorrectly (which can happen to a small percent on any question), or - as Ed Christopher
notes - the odd response could be the result of imputing values to fields with no response
(which can also give nonsensical results to a small percent). Again, as Ed notes, having
a company car (that is not owned by the commuter) might create a head-scratching moment
for the respondent, leading to this result in a small percent of cases.
Keep in mind too, that the question asks how the respondent got to work the majority of
days last week, which could have been a non-standard work week for the respondent, such as
when they go to a conference in a distant city. For us, that has shown up in our dataset
as "walking to work" at a job on the other side of the continent (e.g., from the
hotel room to the conference room?), or traveling by ferryboat when none serves our
community.
Sometimes the best strategy for dealing with the anomalous outliers is to read the exact
wording of the question, imagine potential oddball scenarios that could create them, then
ignore them with a clear conscience.
Pete Swensson, Senior Planner
Thurston Regional Planning Council
2424 Heritage Ct. SW
Olympia, WA 98502
(360) 741-2530 (direct line)
(360) 956-7575 (main desk)
(360) 956-7815 (fax)
swenssp(a)trpc.org
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-----Original Message-----
From: ctpp-news-bounces(a)chrispy.net [mailto:ctpp-news-bounces@chrispy.net] On Behalf Of
Don Burrell
Sent: Tuesday, March 02, 2010 1:13 PM
To: 'ctpp-news(a)chrispy.net'
Subject: [CTPP] RE: No Car but Drive Alone to Work
Have you ruled out bicycling?
Don Burrell, AICP, Senior Planner
Bicycle / Pedestrian Coordinator
OKI Regional Council of Governments
720 East Pete Rose Way, Suite 420
Cincinnati, OH 45202-3576
513-621-6300
513-621-9325 - fax
dburrell(a)oki.org
<A bicycle is an instrument for playing the road>
-----Original Message-----
From: ctpp-news-bounces(a)chrispy.net [mailto:ctpp-news-bounces@chrispy.net] On Behalf Of
Cook, Cliff
Sent: Tuesday, March 02, 2010 3:52 PM
To: 'ctpp-news(a)chrispy.net'
Subject: [CTPP] No Car but Drive Alone to Work
I'm hoping someone can help me address this question from a colleague. He put
together a table from the 2006-2008 ACS showing mode of journey to work by vehicles owned
and came up with surprisingly large numbers who do not won a car yet drive alone to work.
No doubt, there are a few people who fit this category but my guess is that this largely
is the result of either people misunderstanding the question or some sort of coding
problem. Here is an excerpt from his email ( the Cambridge here is Cambridge,
Massachusetts):
I'm looking at ACS data and specifically at cities and percent workers have no car
available. From that I'm then looking to see how those workers get to work.
The attached worksheet shows my work. What is strange is that it shows for Cambridge that
6.6% of people without a car available drove alone to work. The percent is similar to
Boston. And NYC has 3.4% of workers with No vehicles available driving alone to work.
So, the question is, how can someone without a vehicle drive to work alone? Do you have
any ideas on this? It could be someone doesn't own a vehicle, but drives a
friend's car to work. Or has no car of their own, but uses a company car to get to
work. But seems like a high number for this.
Can anyone shed any light on this?
Thanks
Cliff Cook
-----------------------------------------------------------------------------
Clifford Cook
Planning Information Manager
Cambridge Community Development Dept.
344 Broadway
Cambridge, MA. 02139
617/349-4656 FAX 617/349-4669 TTY 617/349-4621
email => ccook(a)cambridgema.gov
web site => <http://www.cambridgema.gov/~CDD/>
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