Michael:
Short answer: very well.
Long answer:
The wording on the ACS vehicle availability question is identical to
the Census 2000 question. It's placement in the ACS is between the two
housing utility questions (plumbing/kitchen/telephone facilities, and
home heating), so these are all the "easy" housing questions before one
has to answer the "difficult" housing questions (e.g., how much is spent
on x, y, and z....)
We've done some county and regional level tabulations of our region's
auto ownership patterns, from 1960 to 2006, and the trends do make good
sense at both the regional and county level. There are some
ups-and-downs in the county-level zero vehicle shares, comparing 2000 to
2005 to 2006, but these may not be statistically significant. (We
published this data, released in I believe September 2007, for a
November 2007 regional workshop, url:
http://www.mtc.ca.gov/maps_and_data/datamart/census/)
Our regional share of zero-vehicle households has declined from 19.7%
in 1960, to 15.8% in 1970; 12.2% in 1980; 10.5% in 1990; 10.0% in 2000;
and then 9.5% in 2005, and 9.2% in 2006. This is for the nine-county San
Francisco Bay Area.
For San Francisco City, the zero-vehicle household share has decreased
from 42.1% in 1960; 39.6% in 1970; 34.6% in 1980; 30.7% in 1990; 28.6%
in 2000; and then with the ACS: 31.3% in 2005, but dropping back to
28.6% in 2006 (same as 2000).
So, we're anxiously awaiting the 2007 annual ACS data that's scheduled
for released next month and September, and then the 3-year period
estimates (2005-2007) expected this December. The challenge will be how
to analyze and report all of this data in a timely manner, all the while
trying to do our "regular jobs."....The other challenge: do we just
report the estimates WITHOUT their standard errors necessary in
understanding the year-to-year, or period-to-period difference; or do we
take the EXTRA time needed to report the estimates WITH the standard
errors (adding, or perhaps "delaying" the reporting of the results by
say 3 to 6 months?
Chuck
**************************************************************
Charles L. Purvis, AICP
Principal Transportation Planner/Analyst
Metropolitan Transportation Commission
101 Eighth Street
Oakland, CA 94607-4700
(510) 817-5755 (office)
(510) 817-7848 (fax)
cpurvis(a)mtc.ca.gov (e-mail)
www: http://www.mtc.ca.gov/
**************************************************************
>>> Michael.Cline(a)utsa.edu 07/28/08 7:38 AM >>>
Chuck (or others),
In your opinion, how well do you think ACS is estimating Zero Vehicle
Households? (or conversely household vehicle ownership?)
Michael E. Cline
Research Associate
Institute for Demographic & Socioeconomic Research
The University of Texas at San Antonio
1 UTSA Circle
BB 4.06.10
San Antonio, TX 78249-0704
(210)458-6537 f(210)458-6541
michael.cline(a)utsa.edu
http://idser.utsa.edu
I will be out of the office starting 07/28/2008 and will not return until 09/01/2008.
I am out of the office indefinitely at this time. Please contact Janette Lawson ext. 6855 or Kathleen Thompson ext. 6841for assistance.
The current issue of ESRI's ArcUser magazine has yet another article in
a very good series by the ESRI chief demographer, Lynn Wombold. It's
available online at:
http://www.esri.com/news/arcuser/0708/demoarticle.html
"Examining Error: Consider the Effect of Sample Size and Error Source
when using census data." ArcUser magazine, spring 2008, pp. 8-11.
Chuck
Here's Elaine's link to the winter 2008 article:
**************************************************************
Charles L. Purvis, AICP
Principal Transportation Planner/Analyst
Metropolitan Transportation Commission
101 Eighth Street
Oakland, CA 94607-4700
(510) 817-5755 (office)
(510) 817-7848 (fax)
cpurvis(a)mtc.ca.gov (e-mail)
www: http://www.mtc.ca.gov/
**************************************************************
>>> "Murakami, Elaine" <Elaine.Murakami(a)fhwa.dot.gov> 05/06/08 2:42 PM
>>>
For a nice article on ACS sampling, please see:
http://www.esri.com/news/arcuser/0408/samplesize.html
Sample Size Matters: Caveats for users of ACS tabulations by Lynn
Wombold, ESRI Chief Demographer
ArcUser Winter 2008 pps 9-11
Elaine Murakami
FHWA Office of Planning
206-220-4460
I will be on vacation @ noon Monday, July 21, 2008 and will return Wednesday, July 23, 2008.
Should you have any questions, please contact Kaye Schultz or Jannis Corley @ (989) 790-5267.
Sincrerely,
Laura McClean
Commissioner Aide
Saginaw County Board of Commissioners
111 S. Michigan Avenue
Saginaw, MI 48602
Ph: (989) 790-5268
Fax: (989) 790-5569
Rolf--I am posting this query to the planners listserve (TMIP) which
might be another good place to cast for historic data. I would not be
surprised if some of the bigger regions might be able to go back to 1980
and even 1970. I would however be surprised if much would turn up in
the way of digital files but just knowing what is there and where to
look is valuable information in its own right.
-------- Original Message --------
Subject: [CTPP] Long-term data on job locations
Date: Fri, 18 Jul 2008 11:07:33 -0400
From: Rolf Pendall <rjp17(a)cornell.edu>
To: ctpp-news(a)chrispy.net
Hi folks --
Has anyone out there run into, used, or generated digital data going
back
as far as, say, 1950 on the location of jobs? I'm interested in
sub-county
level data, at least municipalities (or MCDs), for as many metropolitan
areas and counties as possible.
Thanks in advance.
Rolf
Rolf Pendall / Associate Professor
Department of City and Regional Planning / Cornell University
214 W. Sibley Hall, Ithaca, NY 14853
Ofc: 607-255-5561 / Fax: 530-678-8103 / rjp17(a)cornell.edu
www.people.cornell.edu/pages/rjp17/
_______________________________________________
ctpp-news mailing list
ctpp-news(a)chrispy.net
http://www.chrispy.net/mailman/listinfo/ctpp-news
I will be out of the office starting 07/18/2008 and will not return until
08/03/2008.
I will respond to your message when I return. I will be checking voicemail
periodically.
Hi folks --
Has anyone out there run into, used, or generated digital data going back
as far as, say, 1950 on the location of jobs? I'm interested in sub-county
level data, at least municipalities (or MCDs), for as many metropolitan
areas and counties as possible.
Thanks in advance.
Rolf
Rolf Pendall / Associate Professor
Department of City and Regional Planning / Cornell University
214 W. Sibley Hall, Ithaca, NY 14853
Ofc: 607-255-5561 / Fax: 530-678-8103 / rjp17(a)cornell.edu
www.people.cornell.edu/pages/rjp17/
