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 -----Original Message----- From: ctpp-news-bounces(a)chrispy.net [mailto:ctpp-news-bounces@chrispy.net] On Behalf Of Chuck Purvis Sent: Wednesday, July 23, 2008 5:30 PM To: ctpp-news(a)chrispy.net Subject: [CTPP] ESRI article on ACS errors 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/ ************************************************************** 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 _______________________________________________ ctpp-news mailing list ctpp-news(a)chrispy.net http://www.chrispy.net/mailman/listinfo/ctpp-news

Thank you. Now I recall sitting in on a webinar with Nanda discussing the issue of "under-reporting" for Zero Vehicle households as noted on this document. That is what I was noting in some of the data I was reviewing which led me to my question. Thank you Elaine and Chuck for your help. Mike 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 -----Original Message----- From: ctpp-news-bounces(a)chrispy.net [mailto:ctpp-news-bounces@chrispy.net] On Behalf Of Murakami, Elaine Sent: Monday, July 28, 2008 11:37 AM To: ctpp-news(a)chrispy.net Subject: RE: [CTPP] ESRI article on ACS errors After the Census Bureau released the 2005 ACS data in 2006, I started working on the "highlights" document attached to accompany the profile sheets that Nanda Srinivasan prepared (for a limited number of geographic units). However, this document never went through the official FHWA review process and I did not add it to any website! So, please do not consider it OFFICIAL, it is just a DRAFT! The profiles sheets which include MOE in percent values and number values are on the AASHTO webpage: http://ctpp.transportation.org/home/default.htm The vehicle availability tables are in the "residence" profiles (Workers in Households). We did not re-do the profile sheets after the release of the 2006 ACS data. However, we plan to re-do the profile sheets when the 3-year ACS standard tabulations (2005 thru 2007) are available (close to the end of calendar year 2008). Elaine Murakami 206-220-4460 -----Original Message----- From: ctpp-news-bounces(a)chrispy.net [mailto:ctpp-news-bounces@chrispy.net] On Behalf Of Michael Cline Sent: Monday, July 28, 2008 7:39 AM To: ctpp-news(a)chrispy.net Subject: RE: [CTPP] ESRI article on ACS errors 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 -----Original Message----- From: ctpp-news-bounces(a)chrispy.net [mailto:ctpp-news-bounces@chrispy.net] On Behalf Of Chuck Purvis Sent: Wednesday, July 23, 2008 5:30 PM To: ctpp-news(a)chrispy.net Subject: [CTPP] ESRI article on ACS errors 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/ ************************************************************** 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 _______________________________________________ ctpp-news mailing list ctpp-news(a)chrispy.net http://www.chrispy.net/mailman/listinfo/ctpp-news _______________________________________________ ctpp-news mailing list ctpp-news(a)chrispy.net http://www.chrispy.net/mailman/listinfo/ctpp-news