23 Jul
2015
23 Jul
'15
9:28 a.m.
I agree with Sam.
Having been responsible for some self-administered surveys, I now assume some respondent
error exists in the CTPP/ACS data -- not everyone is good at understanding the questions.
In fact, the ACS database is now very good at showing us how much error to expect.
A good comparison would be to look at home interview surveys that have a higher degree of
quality control. I'm sure there are valid reasons for a zero-car household drive
alone, but it would be a tough sample size to draw conclusions from.
-----Original Message-----
From: Sam Granato [mailto:sundaydriver8@gmail.com]
Sent: Thursday, July 23, 2015 9:13 AM
To: ctpp-news(a)chrispy.net
Subject: Re: [CTPP] Commuters Who Drive Alone but Do Have Access to a Vehicle
You can look at cross tabs of almost any question in ACS or CTPP and see some illogical
combination of answers, as there will always be some folks who either accidentally or
willfully check the wrong box. Transport questions may be more vulnerable to this than
other topics in the ACS because of how far back in the booklet they are.
Sent from my iPhone
On Jul 23, 2015, at 9:50 AM, ALANPISARSKI
<ALANPISARSKI(a)alanpisarski.com> wrote:
This has been around too long to be explained by car2go or others like
it but it may be adding to the numbers. We have often just attributed
it to using friends' cars or uncle Harry's. some may interpret the
census question which asks about household vehicles available as not
pertaining to a company car. Depends how they interpret family or
available. We have seen the rise in this and in "Other" with the
Census unable to explain it or give greater info for us to interpret.
We need a small study of "Other". I have interpreted Other to be, e.g., a
school bus driver who brings the bus
home-but it's not a household vehicle available. AEP
-----Original Message-----
From: ctpp-news-bounces(a)chrispy.net
[mailto:ctpp-news-bounces@chrispy.net]
On Behalf Of Greta Ryan
Sent: Thursday, July 23, 2015 9:26 AM
To: ctpp-news(a)chrispy.net
Subject: Re: [CTPP] Commuters Who Drive Alone but Do Have Access to a
Vehicle
No, he didn't give any numbers he was just explaining how car sharing
works and what someone could use it for. He didn't explicitly say it
was happening. You could probably talk with the car share company in Cambridge.
I would think they would be interested in your situation.
-----Original Message-----
From: ctpp-news-bounces(a)chrispy.net
[mailto:ctpp-news-bounces@chrispy.net]
On Behalf Of Cook, Cliff
Sent: Thursday, July 23, 2015 9:10 AM
To: <ctpp-news(a)chrispy.net>
Subject: Re: [CTPP] Commuters Who Drive Alone but Do Have Access to a
Vehicle
Greta
Was Nick Hill able to provide any numbers to back this up? We do have
a robust car share network in Cambridge so that could be part of the answer.
Cliff
Sent from my iPhone
Possibly
these people use such a service to commute.
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On Jul
23, 2015, at 8:52 AM, "Greta Ryan"
<GRyan(a)richmondregional.org>
wrote:
Cliff,
I was just at an ITSVA conference where Nick Hill from Car2Go spoke.
Greta Ryan
Senior Planner
Richmond Regional Planning District Commission Suite 200
9211 Forest Hill Avenue
Richmond VA 23235
(804) 323-2033
Richmond Regional TPO
-----Original Message-----
From: ctpp-news-bounces(a)chrispy.net
[mailto:ctpp-news-bounces@chrispy.net]
On Behalf Of Cook, Cliff
Sent: Thursday, July 23, 2015 8:41 AM
To: ctpp-news(a)chrispy.net
Cc: Krause, Henry
Subject: [CTPP] Commuters Who Drive Alone but Do Have Access to a
Vehicle
We are preparing an analysis of the 2006-10 CTPP flow data to support
our
transportation planning program. An issue that has come up is that we
are seeing a small but noticeable proportion of commuters who state
they have 0 vehicles available but whose primary commute mode is
driving alone. Aside from the obvious explanation of making a mistake
when completing the ACS survey can anyone provide thoughts on how we might explain this
anomaly?
Thanks
Cliff Cook
Clifford Cook, Planning Information Manager Cambridge Community
Development
Department
344 Broadway, Cambridge, MA. 02139
www.cambridgema.gov/CDD
ccook(a)cambridgema.gov
M: 8:30-8:00 T-Th: 8:30-5:00 F: 8:30-Noon
617/349-4656
617/349-4669 FAX
617/349-4621 TTY
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