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2560 discussions

by ed christopher

The latest "Status Report" newsletter is now posted on line. The direct link is http://www.TRBcensus.com/newsltr/sr0807.pdf Alternatively, it can be found through http://www.TRBcensus.com/ -- Ed Christopher Resource Center Planning Team Federal Highway Administration 19900 Governors Drive Olympia Fields, Illinois 60461 708-283-3534 (V) 708-574-8131 (cell) 708-283-3501 (F)

18 years, 9 months

Useful links to training on using ACS data

by Murakami, Elaine

Now that the Census Bureau is busy releasing the 2006 ACS data, I thought it would be timely to post a few links on using the ACS data. It is VERY IMPORTANT to understand that the biggest difference between the 2006 and 2005 ACS is that GROUP QUARTERS population was ADDED in the 2006 sample. Areas with large Group Quarters population will see the greatest differences between 2006 and 2005 results. Workers who live in Group Quarters are more likely to walk to work, so you may see shifts in distributions of means of transportation to work in these areas. The population threshold for reporting 1-year ACS data is still 65,000 persons, based on place of residence. The 2005 and 2006 ACS standard tabulation include tabulations for PLACE OF WORK called "for workplace geography". Also, the "key" to finding tables on "journey to work" is "08", for example: B08###, or C08###, or S08##. Cynthia Taeuber's book, "American Community Survey data in Community Planning" (Trafford Publishing, 2006 website: trafford.com/06-2809 ) is an easy-to-understand document that covers basic information about ACS, but most importantly, understanding sampling error and confidence intervals. Note: The Census Bureau is now using the term "Margin of Error" to reflect sampling error instead of using confidence intervals (the estimate with an upper and lower bound). You can order it directly from Trafford.com, which is a "print on demand" publishing house, but I just found it on Amazon. (priced at $26.37 and listed as "in stock" ) Also, Cynthia's material completed for Brookings Institute "for journalists" is on-line at: http://www.brookings.edu/metro/umi/events/20061115_ACSreferenceguide.pdf This document on the Census Bureau's webpage discussing the 2005 ACS is also useful. http://www.census.gov/acs/www/UseData/advance_copy_user_guide.pdf The FHWA page also includes some material on using ACS data, which was developed for earlier releases of ACS, but are still relevant. http://www.fhwa.dot.gov/planning/census/acs.htm Because we prepared profiles sheets from the 2005 ACS data, with comparison to Census 2000, we are currently NOT planning to issue NEW profiles using the 2006 data. We are currently focusing on PLANS for the NEXT CTPP, using the first 3 year accumulation of ACS data (2005, 2006, and 2007), and conducting research on 1) improving workplace imputation for ungeocoded survey responses, and 2) alternative approaches to disclosure avoidance, to avoid the data suppression problems that arose in the CTPP2000. If you have ideas for the 3-year CTPP product, especially NEW or DIFFERENT Tables, please let me know! Elaine Murakami FHWA Office of Planning 206-220-4460

18 years, 9 months

A big chunck of ACS data in now out on the street

by Ed Christopher

Taken from the Census Bureau Press Release........Don't forget to do your significance tests when comparing to 2005 and 2000 and keep in mind that the 2006 data contains group quarters. The Census Bureau today released 2006 ACS social, economic, and housing characteristics, demographic and housing estimates, and PUMS data. Data are again available for the nation, the 50 states and the District of Columbia, Puerto Rico, every congressional district, and all counties, places, and metropolitan areas with populations of 65,000 or more. Key topics included in this release consist of: *Educational attainment *Industry *Occupation *Class of worker *Journey to work *Employment status *Work status *Veteran status *Housing *Households and families *Marital status *Migration These data may be found at: http://factfinder.census.gov/home/saff/main.html?_lang=en. As noted in the 2006 ACS data release on Aug. 28, 2007, this year marks the first time that ACS data products cover the total U.S. population, including populations residing in group quarters (such as prisons, college dormitories, military barracks, and nursing homes). The Census Bureau's Web site now contains guidance on comparing 2006 ACS data to 2005 ACS data, as well as comparing 2006 ACS data to Census 2000 data. This guidance may be found at: http://www.census.gov/acs/www/UseData/compACS.htm. The final release of 2006 ACS data will occur on Sept. 27, 2007 and consist of selected population profiles/tables for about 200 selected population groups by race, Hispanic origin, and ancestry. In addition, this release will include group quarters profiles, the first such release since the 1990 Census. Also released at that time will be workplace geography tables. -- Ed Christopher 708-283-3534 (V) 708-574-8131 (cell) FHWA RC-TST-PLN 19900 Governors Dr Olympia Fields, IL 60461

18 years, 9 months

American Community Survey Alert, Number 52 (SPECIAL NOTICE)

by Murakami, Elaine

Some of you have already seen this, but I thought it was important to re-post to the CTPP list. The Census Bureau is asking for comments on data products for the ACS multiyear tabulation. The first release will use responses from 2005 thru 2007. The population threshold for 3-year accumulations from ACS is 20,000 persons, so data for many more counties and places will be available, compared to the 1-year ACS tabulations. Responses are due by September 27, 2007. Elaine Murakami FHWA Office of Planning 206-220-4460 -----Original Message----- From: acs-alert-admin(a)lists.census.gov [mailto:acs-alert-admin@lists.census.gov] On Behalf Of cheryl.v.chambers(a)census.gov Sent: Thursday, August 30, 2007 8:54 AM To: acs-alert(a)lists.census.gov Subject: [acs-alert] American Community Survey Alert, Number 52 (SPECIAL NOTICE) American Community Survey (ACS) Alert, Number 52 (released August 30, 2007) **Notice to all subscribers: We have updated the links to information released in "American Community Survey Alert, Number 51" (issued August 28, 2007). They are: Income, Poverty, and Earnings: http://www.census.gov/Press-Release/www/releases/archives/income_wealth/ 010583.html . Federal Register Notice on Proposed ACS Data Products Containing Multiyear Estimates: http://a257.g.akamaitech.net/7/257/2422/01jan20071800/edocket.access.gpo .gov/2007/E7-16850.htm . ___________________________________________________________________ The ACS is a key component of the Census Bureau's 2010 Decennial Census Program, which also consists of early planning and modernization of geographic operations and a short-form only for the 2010 Census. ___________________________________________________________________ ***Contact Us If you have questions or comments about the American Community Survey, please call (888) 346-9682 or e-mail cmo.acs(a)census.gov. If you choose to unsubscribe or change your list options, you may do so by visiting this site and entering your e-mail address at the bottom of the page under the ACS-Alert subscriber's section. This will take you to an options page where you may request your password, unsubscribe, or set other options. If you have questions about this list, please send a message to acs-alert-admin(a)lists.census.gov. _______________________________________________ acs-alert mailing list acs-alert(a)lists.census.gov http://lists.census.gov/mailman/listinfo/acs-alert

18 years, 9 months

TAZ delineation timeframes

by Murakami, Elaine

Recently there have been a number of questions about when to delineate TAZs for the NEXT CTPP. We are working with the Census Bureau for TAZ submission for the next CTPP. They have not yet provided us with a cost estimate for the software. It will be a GIS-based approach, as the TAZ-UP process was in CTPP2000. We had a meeting on July 25, and the schedule for TAZ submission into TIGER is most likely going to begin January/Feb 2009. In the last CTPP Status Report http://www.fhwa.dot.gov/ctpp/sr0307.htm , we had slightly earlier dates (I think we said Fall of 2008). By starting a few months later, preliminary (not final) 2010 Census tract and block group boundaries will be available as references for TAZ definition. Many regional models are moving toward smaller and smaller TAZs. In one case, we heard that TAZs were planned to have an average of 120 households. Because the ACS sample size is so much smaller than the decennial census "long form" this might result in only 6-10 completed surveys for housing units, even after 5 years of sampling. We are concerned that the CB might require TAZ to have the same population thresholds as "block groups". The CB issued a Fed Reg notice about raising the population threshold for block groups from 600 to 1200. At today's meeting, the CB said they had gotten a lot of comments that people preferred the CB to keep the threshold at 600. TAZs that are submitted into TIGER for CTPP might need to aggregated your model zones, for example, two of your model TAZ = 1 Census TAZ, otherwise you might risk a lot of data suppression based on disclosure avoidance rules by the Census Bureau's Disclosure Review Board (DRB). We have a meeting set up for August 23 or 24 with the DRB which we hope will provide more insight on how they will consider the next CTPP. We are planning to discuss synthetic data approaches which may result in the ability to provide small TAZ summaries. The Census Bureau is concerned that releasing data for very small geographic units results in data with very large margins of error. They would prefer that larger geographic zones be tabulated to reduce the margin of error. Finally, just as a reminder-small area tabulation (like tracts and TAZ) from ACS is restricted to 5-year accumulation of sample records. Elaine Murakami FHWA Office of Planning 206-220-4460

18 years, 11 months

Re: [CTPP] 2010 Proposed Criteria - Census Tract/Block Group Changes

by Bob Paddock

Yes. Just what the implications are for TAZs in 2010 appear to be uncertain. Robert J. Paddock Transportation Research Metropolitan Council 390 N. Robert Street St. Paul, MN 55101 651 602-1340

18 years, 11 months

2010 Proposed Criteria - Census Tract/Block Group Changes

by John M. Sharp

Is anyone else scratching their heads on the 2010 proposed criteria for census tracts and block groups? Making the lowest level for census tracts 1,200 pop and the lowest for block groups 1,200 pop seems redundant. However, what concerns me are the amount of potential changes to the fundamental census geographic structure in 2010. In 1998/99 we sent our TAZ geography to the Census Bureau, so that it could be included in the development of the 2000 CTPP data. Only a few of our TAZs didn't match the Census Bureau's criteria for a TAZ (census block group boundary issues). Does anyone else think that we should wait to do CTPP/TAZ until "after" the 2010 Census? Due to the overhaul of block groups and possible changes in geography there is a great chance that we will have to redo many of our TAZ boundaries. This would be easier if we know the "new" geography. Any comments? Thanks, John John Sharp Program Coordinator Transportation Planning & Data Services 21 E. Main, Suite 100 Oklahoma City, OK 73104 Telephone: (405) 234-2264 FAX : (405) 234-2200 email: jmsharp(a)acogok.org Website: http://www.acogok.org <http://www.acogok.org/>

18 years, 11 months

CB Center for Economic Studies Discussion papers from Research Data Centers

by Murakami, Elaine

As some of you know, we (the transportation data community) have not had much success using the CB's Research Data Center program that is housed at the Center for Economic Studies. We attempted to use the RDC to examine early ACS results. The RDCs provide researchers with access to confidential microdata and go through careful review before results are released to ensure that no confidential data are released. While glancing at the CES RDC website today, I noticed that several "discussion papers" over the past few years (2005 through current) have included analysis using the 1990 and 2000 decennial census "long form" data to examine patterns of home-to-work. 2004 ACS data are included on the list of available data at the RDC. Typically, these analyses focus on "labor market outcomes." http://www.ces.census.gov/index.php/ces/1.00/cmshome Here are a few that I found: Hellerstein, Judith K; David Neumark; and Melissa McInerney. "Spatial Mismatch or Racial Mismatch? " CES 07-16. June 2007. Job density and employment rates are compared between black and white population (no break-out for "Hispanic"), The authors use the term "racial mismatch" to mean a "lack of jobs into which blacks are hired," in contrast to "spatial mismatch" that argues that jobs are not located near to where people live contributing to lack of employment. They found that space alone plays a relatively minor role in low black male employment rates. They find that jobs that are "available to blacks" is more important, especially for workers with lower education. Wang, Qingfang "How does Geography Matter in Ethnic Labor Market Segmentation Process? A Case Study of Chinese in the San Francisco CMSA" CES-WP-07-09 March 2007 The authors defined Chinese residence and workplace concentrations in the San Francisco Bay area. They found clear market segmentation by gender and job skill among the Chinese immigrants. They assert that the housing market is limited for immigrant ethnic minorities, but that ethnic social networking will influence employment and therefore job location, beyond commute time considerations. The pattern for Chinese immigrant men and women is very different, with men in skilled computer and electronics jobs, and women in lower skilled factory and assembly line jobs. Bayer, Patrick; Stephen L. Ross, and Giorgio Topa. "Place of Work and Place of Residence: Informal Hiring Networks and Labor Market Outcomes." CES 05-23 October 2005. The 1990 Census "long form" data was used to measure social interaction by comparing the propensity of individuals living in the same vs. nearby blocks to work in the same location. They found that residing on the same block increased the probability of working together by over 33 percent. When the characteristics of persons (age, education and presence of children) matched, these interactions were even stronger. Fu, Shine. "Smart Café Cities: Testing Human Capital Externalities in the Boston Metropolitan Area." CES 05-24 October 2005. "Human Capital Externalities" or "knowledge spillover" are benefits that accrue to workers from being close to a dense skilled labor market. Most work done on these externalities have been at the macro-scale of metropolitan areas. This effort examines microgeographic scale of externalities by using census tracts, block groups and blocks. This paper used the 1990 Census long form data using worker and job characteristics and job location. They found that these benefits are very localized within microgeographic scales. So, the good news is that other people besides the transportation community have benefited from the detailed PLACE OF WORK geocoding in the Decennial Census "long form." What can we learn from this? To get projects approved in the CES RDC system, we would probably have better luck if we discussed our research in terms of economic productivity and labor market benefits, rather than benefiting transportation planning. Also, we can expect that researchers on labor market outcomes will want to use ACS results on place of work in the future. Elaine Murakami

19 years

ACS 2006 Data Release Schedule

by Ed Christopher

See the link below for the 2006 ACS release schedule. -------------- The U.S. Census Bureau will release data from the 2006 American Community Survey (ACS) in August and September. This years data release marks the first time that group quarters (such as prisons, college dorms, military barracks and nursing homes) are included in the data products. Closer to the release date, the Census Bureau will provide guidance on making comparisons between annual ACS data products, as well as comparisons between ACS and Census 2000 data. Data will again be available for the nation, 50 states and the District of Columbia, Puerto Rico, every congressional district and all counties, places and metropolitan areas with populations of 65,000 or more. http://www.census.gov/Press-Release/www/releases/archives/american_communit… -- Ed Christopher 708-283-3534 (V) 708-574-8131 (cell) FHWA RC-TST-PLN 19900 Governors Dr Olympia Fields, IL 60461

19 years

Re: [CTPP] Vacancy Rates by quarter

by Richard Lin

Dear Marie, It is very simple: 1. HUD (by USPS): A unit is vacant only after mails had not been collected for 90 days. If the mails were picked up (collected) in 30 day for example, it is not a vacant unit. 2. ACS: On survey day, a unit is treated as a vacant unit if it is not occupied. A one-day definition by ACS compares to USPS's 90-day definition. ________________________________ Richard Lin, Ph.D. Demographer Colorado Department of Local Affairs Division of Local Government 1313 Sherman Street, Room 521 Denver, CO 80203 Phone: (303)866-4989 Fax:: (303)866-2660 richard.lin(a)state.co.us www.DOLA.Colorado.Gov >>> <mbousfield(a)cityofchicago.org> 6/19/2007 12:50 PM >>> I compared the HUD vacancy rates with the ACS vacancy rates. The former are low and the latter very high. Have others found this too and is there an explanation? Thanks, Marie Bousfield City of Chicago _______________________________________________ ctpp-news mailing list ctpp-news(a)chrispy.net http://www.chrispy.net/mailman/listinfo/ctpp-news

19 years

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