CTPP

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3069 discussions

[CTPP] RE: seeking guidance on worker flows from the local employment dynamics

by Graham

John, I got involved with this 6 years ago, when Minnesota was the first pilot state. Maybe I can do plain English... Census LED works with state employment agencies (Unemployment Insurance, Labor Statistics, etc.) and with Federal data sources to data-mine residential location and worksite of all covered SSNs. State employment agencies know where everyone works (* everyone who's legally employed, that is). And the Feds know where everyone lives, with linked SSN (again, caveats to this). This project is the fruit of the CIPSEA Act of 2002 - allows agents of the Dept of Labor, Census Bureau, other Fed agencies, to share what would otherwise be "private" or "nonpublic" data. And the deliverable is a Census Block-level origin-destination table with a count of commuting workers (jobs). Very detailed! In fact, so detailed that Census disclosure gurus determined need to limit the detail provided in certain data elements - and to smudge or "fuzz" geographic specificity of employment worksites. I understand discomfort with smudging, fuzzing, and simulating. Still, I'd look to this source for origin-destination pair granularity that future ACS-based CTPP will be flat-out unable to provide. In the future, I can imagine Census LED being combined (thru Iterative Proportional Fitting) with Census ACS summaries (control totals) and ACS PUMS to produce synthetic population with detailed residence-to-worksite linkage. But this is just a dream right now, and not sure it's a vision that others share. -- Todd Graham Metropolitan Council Research 651/602-1322 ---------------------------------------------------------------------- Date: Mon, 6 Oct 2008 08:38:49 -0400 From: "John Hodges-Copple" <johnhc(a)tjcog.org> Subject: [CTPP] seeking guidance on worker flows from the local employment dynamics On The Map data To: <ctpp-news(a)chrispy.net> Does anyone have a short, "plain English" explanation of the residence-to-workplace flows from this data and how it compares to the old long-form commuting data from the 2000 and earlier censuses (censi?). I read "synthesized" data and little red flags go up. Specifically, is this data based on actual residence and workplace data of real individuals (as with the Census), or are the residence and workplace locations from different data sources and the travel between the 2 synthesized in some way, as a travel demand model would create travel patterns between the 2? Any guidance would be appreciated; my brief hunting through the documentation didn't give me the clear specifics I was hoping. Thanks, John Hodges-Copple, Planning Director Triangle J Council of Governments PO Box 12276 Research Triangle Park, NC 27709 919-558-9320 johnhc(a)tjcog.org www.tjcog.org

16 years, 10 months

[CTPP] Need your thoughts on CTPP products using ACS standard tables

by Murakami

Hi Everyone - I bet you have a lot of questions about CTPP using the first 3 years of ACS and TAZs, but unfortunately, I can't answer them yet! Given the current uncertainty of the next CTPP ("custom tabulation") using the ACS, we are moving forward to develop products using standard ACS products. Some of you will recall that we created a series using the first 2005 ACS data products. They are posted on both the FHWA web http://www.fhwa.dot.gov/planning/census/2005tpoverview.htm and on the AASHTO web http://ctpp.transportation.org/ On December 9, 2008, the Census Bureau plans to release the first 3-year ACS products (surveys completed in 2005, 2006 and 2007). The minimum population threshold is 20,000 for the 3-year products, compared to 65,000 population for the ACS 1-year products. So, while the data is still "swiss cheese," that is, geographic coverage has holes, a lot more geographic units will be available. The results are still subject to the Census Bureau rules of "collapsing and filtering" which means that sometimes the data have been suppressed and you will see an "N". We are now designing new profile sheets, in which we plan to include data from 2000 (using Census Summary File 3 and CTPP2000) and from 2005-2007 ACS. Please let me know if you have any recommendations for specific tables to include (the data must be available in both 2000 and from the 2005-2007 ACS). One recommendation from Nathan Erlbaum (NYS DOT) is to create a spreadsheet macro that will sum up multiple geographic units and re-calculate the Margin of Error (using the materials on Page 96-98 in NCHRP Report 588). Also, I am wondering if there is any interest in an updated "Journey to Work Trends" report to include the 2005-2007 ACS results. http://www.fhwa.dot.gov/ctpp/jtw/index.htm This report was limited to metropolitan areas with population over 1 million, but had trend data including 1960, 1980, 1990 and 2000. Because of redefinitions of metropolitan areas by OMB, the data need to be accumulated from county records for historical comparability, which makes for quite a bit of work. The last report used the 1999 definition, but the 2005-2007 ACS data will be reported using the 2007 OMB definitions (I think). My question for you is: is this report useful enough to spend time and resources on? Thanks in advance for your opinions. Elaine Murakami FHWA Office of Planning (Wash DC) 206-220-4460 (in Seattle)

16 years, 10 months

Re: [CTPP] Need your thoughts on CTPP products using ACS standard tables

by Rob CASE

Elaine, To answer your question, the "Journey to Work Trends" is useful to me, but I would prefer that it be done "decennially" (and rigorously), adding 2010 (perhaps via an average of 2009-2011 data) to the previous years (1960, 1980, 1990, 2000), providing consistent 10-year time gaps. Rob >>> Elaine.Murakami(a)fhwa.dot.gov 10/1/2008 5:17 PM >>> Hi Everyone - I bet you have a lot of questions about CTPP using the first 3 years of ACS and TAZs, but unfortunately, I can't answer them yet! Given the current uncertainty of the next CTPP ("custom tabulation") using the ACS, we are moving forward to develop products using standard ACS products. Some of you will recall that we created a series using the first 2005 ACS data products. They are posted on both the FHWA web http://www.fhwa.dot.gov/planning/census/2005tpoverview.htm and on the AASHTO web http://ctpp.transportation.org/ On December 9, 2008, the Census Bureau plans to release the first 3-year ACS products (surveys completed in 2005, 2006 and 2007). The minimum population threshold is 20,000 for the 3-year products, compared to 65,000 population for the ACS 1-year products. So, while the data is still "swiss cheese," that is, geographic coverage has holes, a lot more geographic units will be available. The results are still subject to the Census Bureau rules of "collapsing and filtering" which means that sometimes the data have been suppressed and you will see an "N". We are now designing new profile sheets, in which we plan to include data from 2000 (using Census Summary File 3 and CTPP2000) and from 2005-2007 ACS. Please let me know if you have any recommendations for specific tables to include (the data must be available in both 2000 and from the 2005-2007 ACS). One recommendation from Nathan Erlbaum (NYS DOT) is to create a spreadsheet macro that will sum up multiple geographic units and re-calculate the Margin of Error (using the materials on Page 96-98 in NCHRP Report 588). Also, I am wondering if there is any interest in an updated "Journey to Work Trends" report to include the 2005-2007 ACS results. http://www.fhwa.dot.gov/ctpp/jtw/index.htm This report was limited to metropolitan areas with population over 1 million, but had trend data including 1960, 1980, 1990 and 2000. Because of redefinitions of metropolitan areas by OMB, the data need to be accumulated from county records for historical comparability, which makes for quite a bit of work. The last report used the 1999 definition, but the 2005-2007 ACS data will be reported using the 2007 OMB definitions (I think). My question for you is: is this report useful enough to spend time and resources on? Thanks in advance for your opinions. Elaine Murakami FHWA Office of Planning (Wash DC) 206-220-4460 (in Seattle)

16 years, 10 months

[CTPP] Laura McWethy is out of the office.

by Laura McWethy

I will be out of the office starting 10/01/2008 and will not return until 10/16/2008. I will respond to your message when I return.

16 years, 10 months

[CTPP] ACS Annual Data Release

by Ed Christopher

American Community Survey 2007 American Community Survey Characteristics Data â On Sept. 23, the Census Bureau will release 2007 data on social, economic, housing and demographic characteristics. These data cover topics ranging from language to education, from family size to work commute, and are available for more than 7,000 areas, including all congressional districts as well as counties, cities, metro areas and American Indian and Alaska Native areas of 65,000 population or more. http://www.census.gov/acs/www/Products/index.html -- Ed Christopher 708-283-3534 (V) 708-574-8131 (cell) FHWA RC-TST-PLN 19900 Governors Dr Olympia Fields, IL 60461

16 years, 11 months

[CTPP] HISTORICAL files from decennial census "long form" data

by Murakami

First, let me introduce everyone in the CTPP community to Ms. Liang Long. Liang has her PhD from the University of Illinois, Chicago, so she is really Dr. Long, but we will not be formal here! Liang is now working part-time on CTPP, as contractor to FHWA from Cambridge Systematics, as was Nanda Srinivasan. Liang will have my OLD phone number 202-366-6971 at the USDOT building in Washington, D.C. The major part of this job is to provide technical assistance on CTPP. Her email address is Liang.Long(a)dot.gov Since Nandu's departure from the CTPP program last November, I picked up a bunch of the tech support calls. Some of the recent questions have been on data from 1960! I found that the CB has scanned a lot of the printed material. I asked my friends at the Univ of Washington which is a government repository library to identify the TABLE NUMBERS from the printed reports to make it easier to find transportation and "journey to work" items in the scanned materials. HISTORIC FILES from decennial Census "long form" http://www.census.gov/prod/www/abs/decennial/index.htm Hope this information might be useful to you! Elaine Murakami FHWA Office of Planning (Wash DC) -----Original Message----- From: Eleanor Chase [mailto:echase(a)u.washington.edu] Sent: Thursday, September 04, 2008 7:00 PM To: Murakami, Elaine Subject: journey to work table numbers In the printed volumes there are separate subject reports on journey to work, generally v.2, pt 6 (with various subletters) for 60, 70 and 80 For the US summary volume 1960 General Social and Economic Characteristics tables 94, 136, 302, 303 1970 tables 87, 242, 243 US summary; 87, 98 urban/rural; 109 metro/nonmetro; 132, 137 regions; 151, 152 regions, divisions & states; 363, 364 SMSA 1980 tables 101, 122, 132, 142, 152, 161, 167, 174 US summary; 101, 112, 122, 132 urban /rural; 101, 112, 142, 152 inside/outside SMSAs; 185, 196, 205 regions; 238 states In the Washington state volumes (and the table numbers should hold true for other states) 1960 table 64 state; 72 SMSA and places 10K+; 131 SMSA 100K+; 82 counties 1970 tables 50, 61 191 state; 82, 190 SMSA and places 50K+; 72 metro/nonmetro; 102 is place of work for places less than 50K 1980 Chapter C tables 65, 75, 85, 94, 100, 107 state; 75, 85 urban/rural; 118, 127, 133, 139, 145, 151 SMSA and places 50K+; 156, 162 places 10K-50K; 166 places 2.5K-10K; 174, 183 Counties 193 American Indian Reservations Remember that a lot of these multiple tables will break by race and ancestry groups in 1980, but the first table is usually the basic totals Eleanor and Hilary University of Washington Library Government Documents

16 years, 11 months

[CTPP] Michael D Brienzo is out of the office.

by MBrienzo＠ci.lincoln.ne.us

I will be out of the office starting 08/21/2008 and will not return until 08/25/2008. I will respond to your message when I return.

17 years

[CTPP] Diana Portillo is out of the office.

by Diana Portillo

I will be out of the office starting 08/20/2008 and will not return until 08/25/2008.

17 years

[CTPP] American Community Survey Release Schedule

by Ed Christopher

If you are not aware of the ACS release schedule... -------- Original Message -------- Subject: [acs-alert] American Community Survey Alert, Number 57 Date: Wed, 20 Aug 2008 08:26:48 -0400 From: cheryl.v.chambers(a)census.gov To: acs-alert(a)lists.census.gov American Community Survey Alert, Number 57 (released August 20, 2008) News in this Alert * A New Look for the ACS Website ** A Look Ahead â The First 2007 ACS Data ____________________________________________________________ * A New Look for the ACS Website The Census Bureau today released the first of several planned changes to the ACS Website. The redesign, implemented in part as a response to numerous requests from data users and stakeholders, includes a streamlined main page where information is logically grouped allowing users to find what they are seeking more quickly and efficiently. A 2007 ACS Data Release page will feature the full 2007 ACS data release schedule and offer clearly-marked sections directing users to data products and guidance on making comparisons, information on using the 2007 data, and what's new for 2007. Users should find it easier to navigate the ACS Website and to locate and access the information they need. The updated Website may be viewed at: http://www.census.gov/acs. ____________________________________________________________ ** A Look Ahead--The First 2007 ACS Data The Census Bureau will release income, poverty, and earnings data from the 2007 ACS, in conjunction with the Census Bureau's annual release of income, poverty, and health insurance data from the Annual Social and Economic Supplement to the Current Population Survey on August 26, 2008. The second release of 2007 ACS data will occur on September 23. The first set of three-year estimates for data collected between 2005 and 2007 will be released in December. These include the first ACS estimates for areas with populations between 20,000 and 64,999. ____________________________________________________________ acs-alert mailing list acs-alert(a)lists.census.gov http://lists.census.gov/mailman/listinfo/acs-alert

17 years

RE: [CTPP] ESRI article on ACS errors

by Chuck Purvis

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

17 years

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