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[CTPP] 2008 ACS selected tables for Metro areas

by Elaine.Murakami＠dot.gov

For your potential use, I extracted 3 tables from the 2008 ACS data (released by the Census Bureau yesterday) and saved as .xls file. Of course, you could have done this yourself, and several of you have probably already made local data sheets. They are: C08134: Means of Transportation to Work by Travel Time B08141: Means of Transportation to work by Vehicles Available C08301: Means of Transportation to work (univariate) I used the data download feature http://factfinder.census.gov/servlet/DownloadDatasetServlet?_lang=en For more information about the ACS Table List, please go here: http://www.census.gov/acs/www/Products/users_guide/index.htm Please be aware that not all Metro Areas will have data available for each table, since the coefficient of variation (CoV) is checked before release. When the table number starts with "C" it means it is the collapsed version. Therefore, you can use the "B" table instead with more categories, by going back into American FactFinder, or the Data Download Center. For each cell, there is an ESTIMATE and a MOE (Margin of Error). The MOE cell does NOT include "+/-" in the cell value (Hurrah!). As a reminder, FHWA prepared transportation profile sheets using Census 2000, CTPP2000 and the 2005-2007 ACS results which are posted on the CTPP AASHTO webpage http://ctpp.transportation.org/profiles_2005-2007/ctpp_profiles.html These profiles include State, County and Place, and do NOT include Metropolitan Area totals. Because they use an accumulation of three years of ACS, the population threshold is 20,000 and therefore, more geographic areas are available. We are not planning to update these profile sheets when the next 3-year ACS (2006-2007-2008) data are released. Elaine Murakami FHWA Office of Planning

15 years, 11 months

[CTPP] CENSUS NEWS BRIEF

by Ed Christopher

Focus on Promoting the 2010 Census: News from Capitol Hill: 2010 Census "Partner" News: Delay in Release of Some ACS Data: The Rest of the News FOCUS ON PROMOTING THE 2010 CENSUS Latino organizations hold "summit" on Communications Campaign: More than 40 national Latino organizations, U.S. Census Bureau officials, and media companies working on the targeted Latino communications campaign met last week to discuss efforts to promote census participation among Latinos and ways to coordinate messages about the importance of the decennial count. According to a summary of the meeting prepared by the Latino Census Network, attendees talked about fear of government and concerns about data confidentiality; calls for undocumented residents to boycott the 2010 census until Congress enacts comprehensive immigration reform; the importance of engaging faith-based institutions in census outreach activities; the implications of anti-immigrant sentiments; and other challenges to achieving an accurate count of Latinos. The National Association of Latino Elected and Appointed Officials (NALEO), a member of the 2010 Census Advisory Committee, and Latino Census Network Chairman Angelo Falcon, who serves on the Census Bureau's Advisory Committee on the Hispanic Population, spearheaded the meeting of the Latino Census Communications Group. The September 17 gathering was held at the National Council of La Raza offices in Washington, DC. To sign up for updates from the Latino Census Network, visit the National Institute for Latino Policy web site at www.latinopolicy.org [http://rs6.net/tn.jsp?et=1102710602087&s=12&e=001HGlv0RwB0sCsDryE3AZLjYnGbf…]. All of the Census Bureau's official advisory committees, which are scheduled to hold their regular fall meetings in the coming weeks, will meet jointly on December 9, 2009, to provide final feedback to the agency on the 2010 Census Integrated Communication Campaign. Expert Census Bureau panel applauds paid media campaign development: An independent panel of marketing and communications experts commended the Census Bureau for using industry and academic "best practices" to create the paid media campaign for the 2010 census. The agency formed the five-member Academic Assessment Panel last spring to "evaluate the methods used to define and develop the communications campaign,"according to a Census Bureau press release. Panel Chairman Dr. Jerome D. Williams, the F.J. Heyne Centennial Professor in Communication, University of Texas, Austin, said in a written statement that "the Census Bureau and [Communications Campaign contractor] DraftFCB team have done an exceptional job and are to be applauded for what has been developed so far under very challenging conditions." He called the crafting of the 2010 Integrated Communications Campaign "fundamentally sound." 2010 Census Publicity Office Chief Raul Cisneros said the expert review during the development phase of the media campaign allowed the Census Bureau to incorporate the panel's recommendations for improvements and revisions before it finalized advertising plans. Modified ACS materials seek to minimize confusion in 2010: The Census Bureau will revise current materials or add new ones in conducting the American Community Survey (ACS) next year, to help reduce anticipated confusion among households that receive both the ACS questionnaire and 2010 census form. The ACS samples about 250,000 addresses a month, or 3 million a year, collecting a wide range of demographic, social, housing, and economic data previously gathered on the census long form once every ten years. The ACS was first implemented nationwide in 2005. ACS materials sent to homes in the sample, including a pre-notice letter and at least one questionnaire (unresponsive homes receive a replacement form), will advise recipients that they will be receiving both ACS and decennial census questionnaires in 2010, and that they are required by law to complete both. The agency also will modify packaging for ACS materials next year, using different colors and logos on the envelopes to distinguish them from the 2010 census mail packages. NEWS FROM CAPITOL HILL Senate bill would add citizenship question to decennial census: Sen. Robert Bennett (R-UT) introduced legislation that would require the Census Bureau to collect information on citizenship and legal status in the decennial census, in order to remove undocumented residents from the state population totals used for congressional apportionment. The "Fairness in Representation Act" (S. 1688) calls for a "checkbox or other similar option" on the census questionnaire, to determine if respondents are U.S. citizens or legal residents. In a press statement, Sen. Bennett said it "does not make any sense" for congressional apportionment and representation in the Electoral College "to be determined by a process that unfairly provides the advantage to those communities with high illegal populations." The lawmaker praised the Census Bureau's work but called the apportionment process "broken and unfair." The proposal, if enacted in its current form, would be effective starting with the 2010 census. It takes several years for the Census Bureau to research, develop, and test its forms for a decennial census, and almost a full year to print and address questionnaires. For the last several decades, the census has included a short form sent to all housing units, and a long form sent to a sample of homes; only the long form included a question on citizenship. The American Community Survey, which is replacing the traditional long form in 2010, asks respondents if they are U.S. citizens. Article I, section 2, of the U.S Constitution requires a population census every ten years as the basis for allocating seats in the House of Representatives. As modified by the Fourteenth Amendment (section 2), the apportionment is based on "the whole number of persons in each State, excluding Indians not taxed." Congress debated whether "citizens" or "voters" should be the basis for apportionment when it passed the Fourteenth Amendment in 1866, according to a Congressional Research Service review of similar legislative debates on the eve of the 1990 enumeration (LOC/CRS Report No. 88-62A, January 13, 1988). Since then, lawmakers have considered (but not enacted) a number of proposals to amend the Constitution to exclude non-citizens or undocumented residents from the census population counts used for apportionment. Former Rep. Thomas Ridge (R-PA), ranking member on the census oversight subcommittee at the start of the 1990 census, led a group of Representatives, states, and private organizations in a lawsuit seeking to exclude undocumented residents from the apportionment counts (Ridge v. Verity, 715 F.Supp. 1308, W.D.Penn. 1989); a federal appeals court upheld the lower court's dismissal of the case for lack of standing. More recently, Rep. Candice Miller (R-MI) sponsored a resolution (H.J.Res. 11) to amend the Constitution to exclude non-citizens from the apportionment counts derived from the census. The resolution, which has 11 cosponsors, was referred to the Committee on the Judiciary, which considers all proposed constitutional amendments. The Bennett bill, referred to the Senate Committee on Homeland Security and Governmental Affairs, had three original cosponsors: Sen. Jim Bunning (R-KY), Sen. Mike Crapo (R-ID), and Sen. Michael Enzi (R-WY). House oversight panel to evaluate Communications Campaign: The House Subcommittee on Information Policy, Census, and National Archives (Committee on Oversight and Government Reform) will hold a hearing on September 22, 2009, to examine the 2010 Census Integrated Communications Campaign, including "criteria for implementation" and "measurements for success." Census Bureau Director Robert Groves also will provide an update on preparations for the upcoming decennial count. The hearing will start at 2:00PM in Room 2154 Rayburn House Office Building. 2010 CENSUS "PARTNER" NEWS Census Bureau ends ACORN's 2010 census partnership: Census Director Robert Groves told the Association of Community Organizations for Reform Now (ACORN) that the agency was terminating its Partnership Agreement with the nonprofit organization, citing criteria for determining whether a group can serve effectively as a booster for the 2010 count. The director said in a September 11 letter that "ACORN's affiliation with 2010 Census promotion has caused sufficient concern in the general public, has indeed become a distraction from our mission, and may even become a discouragement to public cooperation, negatively impacting 2010 census efforts."Dr. Groves said the Census Bureau did not "come to this decision lightly," citing the agency's initial hope that ACORN could help encourage census participation among hard-to-count populations, such as the poor, renters, and people whose primary language is not English. ACORN's participation in the Partnership Program drew significant criticism from Republicans in Congress. Sen. Richard Shelby (R-AL) and Sen. David Vitter (R-LA) delayed a vote on Dr. Groves' nomination to be Census Director based, in part, on their concerns about ACORN's role as a 2010 census partner. Rep. Patrick McHenry (R-NC), ranking member on the House census oversight subcommittee, urged the Census Bureau to end the agreement last spring. In a statement calling the director's recent action "welcome news," Rep. McHenry praised Dr. Groves' "courage" for terminating its relationship with ACORN and said he was "sure there are those in the Obama Administration who will not be happy" with the decision. Rep. Darrell Issa (R-CA), the senior Republican on the Oversight and Government Reform Committee (of which the census subcommittee is a part), said, "ACORN's partisan election efforts and its involvement in criminal conduct rightly disqualify it from working on the non-partisan mission of the Census to accurately and honestly count the U.S. population." The congressman said that congressional redistricting and the allocation of federal funds would have been affected "[h]ad ACORN been allowed to submit fraudulent information to the Census." A description of the Partnership Program on the Census Bureau's web site says that partner organizations "are not Census employees and have no responsibility for counting, collecting or processing census data." Community-based organizations, schools, businesses, state and local governments, and other groups may sign a "partnership agreement" with the Census Bureau, promising to be "advocates for census cooperation and participation," according to guidelines for the Partnership Program. A description of the selection process says that partners should be "visible and trusted voices in the communities they serve." Partner organizations are asked to consider a wide range of activities that would promote cooperation with the census, including displaying and distributing materials, volunteering at Census Bureau events, inviting Census Bureau staff to speak at conferences and meetings, helping to translate census materials, providing space to test job applicants, and serving as a Questionnaire Assistance Center or Be Counted site. Partnership Program staff may decline to select organizations as 2010 census partners, according to the guidelines, if applicants "are not trusted or are viewed negatively within the community" or "could distract from the Census Bureau's mission," among other reasons. More than 80,000 national and local organizations have signed partnership agreements in support of the 2010 census; there were about 140,000 partners during the 2000 census. Asian American advocacy group launches census campaign: The Asian American Justice Center (AAJC), a member of the 2010 Census Advisory Committee, has launched a national campaign to mobilize the Asian American community in support of the 2010 census. The effort, which includes partnerships with eight local organizations in areas with significant Asian American populations, will rely on media outreach, community education, and social networking to highlight the importance of census participation. AAJC will translate many of its census campaign materials, such as fact sheets and toolkits, into 15 languages. To access AAJC's census campaign materials, visit www.asianamericancensus.org [http://rs6.net/tn.jsp?et=1102710602087&s=12&e=001HGlv0RwB0sCFtXgWIsbKDIpwlu…]. CODING MISTAKE DELAYS RELEASE OF SOME ACS ECONOMIC TABLES BY ONE WEEK The Census Bureau will release 2008 American Community Survey (ACS) one-year estimates on poverty, family income, and food stamp recipients a week later than planned after discovering a coding error that affected tabulation of the data. The agency said the mistake affected approximately ten percent of the data tables, which it will now publish on September 29. All other data for the roughly 7,000 jurisdictions with a population of 65,000 or greater will be available on September 22, as originally planned. Three-year ACS estimates, for areas with a population of 20,000 or greater, will be released on October 27. The coding mistake involved new check-box options for children and in-laws in the 2008 ACS relationship question; the tabulation of data on family income (which in turn affects poverty and food stamp receipt calculations) failed to account for income from these sources. Members of the press were notified of the problem late last week, when the Census Bureau was scheduled to release the full set of one-year data to the media on an embargoed basis. For more information on the annual ACS data release, see the September 6, 2009 Census News Brief (#73). THE REST OF THE NEWS ... Report highlights importance of count of undocumented residents: The Drum Major Institute for Public Policy has issued a report analyzing the benefits of counting undocumented residents accurately in the decennial census. The self-described "progressive" Institute concludes in "The Next Economic Imperative: Undocumented Immigrants and the 2010 Census" that, "Failing to gather accurate information about an estimated 12 million undocumented residents will make it too difficult for the country to recover from the worst recession in decades: local and state governments won't receive adequate funding for public services; businesses will be discouraged from investing in new markets and creating jobs in growing communities; costly mistakes will be made in infrastructure, education, and health care because of incomplete demographic data. "The nonprofit think tank also has drafted talking points to help immigrant advocates and other groups discuss the importance of counting immigrants. For a copy of the report and the talking points, visit the organization's web site at http://www.drummajorinstitute.org/library/report.php?ID=98 [http://rs6.net/tn.jsp?et=1102710602087&s=12&e=001HGlv0RwB0sC_emfJrQBlcfv0-2…]. Census Project blog tackles key 2010 census policy and operational issues: The Census Project launched a new weekly blog to follow final preparations for and implementation of the 2010 decennial census. If you would like to receive new posts each week via e-mail, click here http://feedburner.google.com/fb/a/mailverify?uri=censusblog&loc=en_US [http://rs6.net/tn.jsp?et=1102710602087&s=12&e=001HGlv0RwB0sC2KOJRHOGvp7je04…] to sign up, or click here http://twitter.com/censusproject [http://rs6.net/tn.jsp?et=1102710602087&s=12&e=001HGlv0RwB0sAYnbisMSZAmbzwYk…] to follow us on Twitter. Census News Briefs are prepared by Terri Ann Lowenthal, an independent legislative and policy consultant specializing in the census and federal statistics. All views expressed in the News Briefs are solely those of the author. Please direct questions about the information in this News Brief to Ms. Lowenthal at TerriAnn2K(a)aol.com. Please feel free to circulate this document to other interested individuals and organizations. Ms. Lowenthal is a consultant to the nonpartisan Census Project, organized by the Communications Consortium Media Center in Washington, DC. Previous Census News Briefs are posted at www.thecensusproject.org [http://rs6.net/tn.jsp?et=1102710602087&s=12&e=001HGlv0RwB0sDx8823CBip7P6sej…]. -- Ed Christopher 708-283-3534 (V) 708-574-8131 (cell) FHWA RC-TST-PLN 4749 Lincoln Mall Drive, Suite 600 Matteson, IL 60443

15 years, 11 months

Re: [CTPP] CTPP 2000 Software question

by Nathan Erlbaum

that is why it needs to be developed in an open source environment >>> edc(a)berwyned.com 9/17/2009 9:55 AM >>> Has anyone tried to load the CTPP 2000 Browser on a Windows Vista machine? I just got wind that it might not work. All my machines are either Home XP or XP Professional and it works fine sans the normal crash message that you just ignore and keep going. I am also trying to get a handle if anyone has run into issues with the software on 32 versus 64 bit systems. -- Ed Christopher 708-283-3534 (V) 708-574-8131 (cell) FHWA RC-TST-PLN 4749 Lincoln Mall Drive, Suite 600 Matteson, IL 60443 _______________________________________________ ctpp-news mailing list ctpp-news(a)chrispy.net http://www.chrispy.net/mailman/listinfo/ctpp-news

15 years, 11 months

Re: [CTPP] CTPP 2000 Software question

by Robert Keeth

Yes, I've tried to load the CTPP Browser on a Windows Vista machine, and get the following error message: Unsupported 16-Bit Application The program or feature "\E:\Extraction Software\software\setup.exe" cannot start or run due to incompatibility with 64-bit versions of Windows. Please contact the software vendor to ask if a 64-bit Windows compatible version is available. Can anybody help me? Thanks. Bob Keeth Volusia County MPO Daytona Beach, FL (386) 226-0422 extension 30 Robert Keeth, Senior Planner Volusia County Metropolitan Planning Organization Indigo Professional Centre, Suite 120 2570 W. International Speedway Boulevard Daytona Beach, FL 32114-8145 (386) 226-0422 ext. 30 - voice (386) 226-0428 - fax PUBLIC RECORDS NOTICE: The Volusia County Metropolitan Planning Organization is governed by the State of Florida public records law. This means email messages, including your e-mail address and any attachments and information we receive online might be disclosed to any person making a public records request. If you have any questions about the Florida public records law refer to Chapter 119 Florida Statutes. >>> Ed Christopher <edc(a)berwyned.com> 09/17/09 10:01 AM >>> Has anyone tried to load the CTPP 2000 Browser on a Windows Vista machine? I just got wind that it might not work. All my machines are either Home XP or XP Professional and it works fine sans the normal crash message that you just ignore and keep going. I am also trying to get a handle if anyone has run into issues with the software on 32 versus 64 bit systems. -- Ed Christopher 708-283-3534 (V) 708-574-8131 (cell) FHWA RC-TST-PLN 4749 Lincoln Mall Drive, Suite 600 Matteson, IL 60443 _______________________________________________ ctpp-news mailing list ctpp-news(a)chrispy.net http://www.chrispy.net/mailman/listinfo/ctpp-news

15 years, 11 months

[CTPP] CTPP 2000 Software question

by Ed Christopher

Has anyone tried to load the CTPP 2000 Browser on a Windows Vista machine? I just got wind that it might not work. All my machines are either Home XP or XP Professional and it works fine sans the normal crash message that you just ignore and keep going. I am also trying to get a handle if anyone has run into issues with the software on 32 versus 64 bit systems. -- Ed Christopher 708-283-3534 (V) 708-574-8131 (cell) FHWA RC-TST-PLN 4749 Lincoln Mall Drive, Suite 600 Matteson, IL 60443

15 years, 11 months

[CTPP] PUMA Update

by Ed Christopher

Someone passed me this today. Apparently it was posted to the State Data Center list serve and provides the current status of what is known about PUMAs. PUMAs are of special importance to the transportation community since they are now a tabulation geography for ACS and provide the only wall-to-wall coverage of annual ACS data for metropolitan areas. If anyone along this list will be involved with the referenced October 14-16 State Data Center meeting please let us know what minimum population thresholds the CB plans to propose for tract based PUMAs. ============= State Data Center Network: The Census Bureau is currently drafting the 2010 Public Use Microdata Area (PUMA) delineation proposed criteria. These draft proposed criteria were developed based on internal meetings with key Census Bureau stakeholders, and with consideration of new challenges and issues associated with the use of PUMAs in the publication of annual American Community Survey (ACS) Public Use Microdata Sample (PUMS) data as well as in the publication of ACS estimates. The Census Bureau will present the 2010 PUMA delineation proposed criteria at the upcoming State Data Center Annual Meeting (October 14-16, 2009) for discussion and comment. Subsequently, pending the approval of the Census Bureau’s Statistical Areas Committee, the Census Bureau will publish the 2010 PUMAs proposed criteria in the Federal Register for public comment. State Data Centers (SDCs) will use the final version of these criteria, as published in a forthcoming Federal Register, to delineate PUMAs for Census 2010 and the ACS. For your consideration, the following represents a high level summary of the planned 2010 PUMA delineation proposed criteria: 1. PUMA types: One “level” of PUMAs will be delineated for the United States, Puerto Rico, Guam, and the U.S. Virgin Islands, as compared with two “levels” of PUMAs for Census 2000 (super-PUMAs and standard PUMAs). Additionally, place of work PUMAs (POW PUMAs) and migration PUMAs (MIG PUMAs) will be based on a single PUMA for county-based PUMAs or an aggregation of adjacent PUMAs for tract-based PUMAs. Note: All subsequent references to PUMAs in this document, unless preceded by “POW” or “MIG”, refer to these standard PUMAs. 2. Population Thresholds: Each PUMA must contain a minimum population of 100,000 both at the time of delineation and throughout the decade for the publication of ACS PUMS data and ACS estimates. For those areas currently experiencing population decline, or where population decline throughout the decade is expected, PUMAs should be initially delineated to include a population significantly higher than 100,000 persons to accommodate this change. Should the population of a PUMA fall significantly below the 100,000 person threshold, the PUMA will be combined with one or more adjacent PUMAs for ACS PUMS and ACS estimate publication. 3. PUMA Composition: All PUMA types (PUMAs, POW PUMAs and MIG PUMAs) must nest within states (i.e., may not cross state boundaries). PUMAs will be based on aggregations of counties and census tracts only. Incorporated places and MCDs will not be used as building blocks for 2010 PUMAs. Census tracts may be aggregated to approximate minor civil divisions, incorporated places, or census designated places. Provided the PUMA meets the minimum population threshold: a. One county may be designated as a PUMA b. Two or more contiguous counties may be aggregated to create a PUMA c. Contiguous census tracts may be aggregated to create a PUMA Tract-based PUMAs may cross county boundaries, provided that each PUMA-county part meets a minimum area and/or population threshold (TBD - The Census Bureau is currently determining an appropriate minimum area and population threshold for these areas, and will provide these minimum thresholds at the SDC Annual Meeting in October). Census tract aggregations may compose or approximate the extent of other types of geographic entities, including minor civil divisions, incorporated places, and census designated places. 4. PUMA contiguity In all cases, each PUMA must constitute a geographically contiguous area. Limited exceptions are presented here: a. A PUMA may be discontiguous if a county is discontiguous. b. A PUMA may be discontiguous when it surrounds another whole PUMA, e.g., if census tracts define a PUMA that approximates an incorporated place or census designated place, a PUMA may be defined to encompass the area within the county surrounding the place The Census Bureau also intends to propose additional guidelines to which delineation participants are strongly encouraged, but not required to, adhere. For your consideration, the following represents a high level summary of the planned 2010 PUMA guidelines: 1. Wherever possible, each PUMA should comprise an area that is either entirely inside or entirely outside Core Based Statistical Areas 2. The Census Bureau recommends that the number of five-percent PUMAs be maximized, and that five-percent PUMAs should not contain more than 200,000 people, wherever possible, unless the PUMA is defined for an area that is or will be experiencing population decline. We appreciate your interest in the 2010 PUMA delineation program, and look forward to discussing the planned proposed criteria with you at the SDC Annual Meeting in October 2009. Should you have more immediate questions please contact the Geographic Standards and Criteria Branch PUMA team at geo.puma(a)census.gov. -- Ed Christopher 708-283-3534 (V) 708-574-8131 (cell) FHWA RC-TST-PLN 4749 Lincoln Mall Drive, Suite 600 Matteson, IL 60443

15 years, 11 months

Re: [CTPP] Documentation on using LEHD OnTheMap files

by Mark Flinner

Thanks Elaine. I haven't actually used OnTheMap other than to explore the web application and try some downloads but I thought that I would forward the caveats that I have run across. Re: Version 3 OTM...(see: http://www.vrdc.cornell.edu/onthemap/data/v3/notes-otm-v3.0.pdf ) V3 Caveats: •QWI numbers are drawn from QWI release R2008Q2. Stable jobs and statistics related to 'stable jobs' have a bug which has been fixed in QWI release R2008Q4. An update to the data is expected later this year. Consult the LEHD site for more details. •Current QWI numbers are considered experimental. Since they are computed using the same confidentiality protection technology as the general QWI numbers, but using much finer geographic cells, there are more suppressions (more smaller numbers to protect). Users should be aware that when aggregating numbers to levels that are comparable to the general QWI data, the numbers they generate will be systematically lower. •Only one implicate has been released at this point. Future updates should be counted (and used) as additional implicates. Additional implicates may be released in the future as well. •WAC, OD, and QWI files are only available for states participating in the LEHD program. RAC files are available for all states, even those not actively participating in the LEHD program, but coverage is limited. For example, a worker of a NJ company (NJ participates in LEHD) may live in NY (which not yet been integrated). Thus, a residence area for this and other workers is defined, and available here for download. However, the residence area information will NOT include information on workers of NY companies, since that information was not available at the time that OnTheMap v3.0 was created. (This applies for v3.0 to: CT, DC, MA, NY, NY, OH, PR, VI). These RAC files can be accessed through the links in the OD AUX files of states where these workers are tabulated. It appears that only one implicate has been released in Version 3. Version 2 documentation from section 1.2.3 at http://www.vrdc.cornell.edu/onthemap/doc/otm_public_master.pdf indicates that three implicates were available and adds the following warning: This version of the data provides 3 implicates (independent draws in the synthesizing algorithm) for the OD matrix and the Residence Area Characteristics (RAC) files. This is reflected in the filenames, see Sections 1.4.3 and 1.4.4. For further information on how to properly analyze multiply synthesized or imputed datasets, see Raghunathan et al. (2003); Reiter (2004b) and Reiter (2004a), or consult Sessions 8a and 8b of the online INFO 747 class at Cornell University's CISER at http://vrdc.ciser.cornell.edu/info747/. A note of warning is in order, though: It is statistically incorrect to use the average of the 3 implicates unless the aggregator function is strictly linear. Adding geographic areas is linear, and forming ratios from two linearly aggregated quantities (earnings over employment, for example) can be done correctly as long as the numerator and the denominator are averaged separately.

15 years, 12 months

[CTPP] Documentation on using LEHD OnTheMap files

by Elaine.Murakami＠dot.gov

We (the royal "we") are interested in personal travel patterns, for a variety of transportation planning applications. The CTPP program will provide home-to-work origin-destination tables using multiple years of surveys from the American Community Survey. But, other data sources should be examined for their potential to augment the CTPP, for small area origin-destination matrices. For example, many of you are aware of my interest in using multi-day GPS. Each data source, including ACS and the CTPP, has its own benefits and limitations. One of the datasets of interest is the LEHD OntheMap "home-to-work" flows. We would like to encourage more analysis and evaluation of the LEHD OnTheMap data. While the LEHD OnTheMap interface is a user-friendly web-based software http://lehd.did.census.gov/led/ , we believe that transportation planners will be more interested in the potential of the synthetic block data records (10 implicates are created in the data synthesis process) to examine the origin/destination flow results. These data are available for download on the Cornell University Virtual Data Center. I asked Laura McWethy at Cambridge Systematics to prepare some documentation on the files, to make it easier for others to examine this data. It is attached. Caveats: The files are large since they represent block-to-block pairs. The data are synthetic. This is the first synthetic data product approved by the Census Bureau's Disclosure Review Board. Data synthesis is used to protect individual confidentiality. The universe of workers (workers covered by unemployment insurance) differs from "all workers" You should take the time to understand the data sources and synthetic data processes used to generate these results. We are interested in your tests of the LEHD OnTheMap block level data. I hope that Nathan Erlbaum and Aaron Westcott of New York State DOT will share the results of their work on county-to-county flows. Introductory material on LEHD OnTheMap is available through a recorded presentation from the TRB Planning Applications conference in Houston http://teachamerica.com/APP09/ (go to the Sunday session and look for DATA), and also at the LEHD OnTheMap home page http://lehd.did.census.gov/led/ . Elaine Murakami FHWA Office of Planning (Wash DC) 206-220-4460 (in Seattle)

15 years, 12 months

[CTPP] automated response

by Douglas Bell

I will be out of the office until Monday, August 31. I will reply to your message when I return.

15 years, 12 months

[CTPP] Tools of the Trade 2010 Call for Abstracts

by Everett

Hello all (Please forgive me if you have already received this information from another source.) Attached is a Call for Abstracts for the next Tools of the Trade Conference. The Conference focuses on transportation planning topics and tools for small and medium-sized areas. The conference will be held in September 2010, in historic Williamsburg, VA. Please review the topics listed in the Call and consider submitting an abstract about work conducted in your area or by your agency that would be of interest to others across the country. In addition, please forward this Call to anyone that you think might be interested in submitting an abstract or in attending the conference. Our committee website has additional information and can be accessed at the following link: http://www.trbtoolsofthetrade.org/conference.html. Jerry Everett Research Director Center for Transportation Research Suite 309 Conference Building 600 Henley Street University of Tennessee Knoxville, TN 37996 (865) 974-8275

15 years, 12 months

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