CTPP April 2005

ctpp@listserv.transportation.org

5 participants
6 discussions

RE: [CTPP] Tutorial for CTPP 2000 browser thematic map, shapefile export?

by Srinivasan

Bryce: After you create your session, click on FILE and EXPORT to a shape file. Please note that the shape fle comes with a DBT file that explains the file headers. Then, you can use your own GIS to make maps in any way you want. The thematic mapping element in the CTPP software is rudimentary, you cannot create thematic maps that normalize by area. Thank you Nanda Srinivasan -----Original Message----- From: ctpp-news-bounces(a)chrispy.net on behalf of Bryce W Nesbitt Sent: Sun 4/17/2005 9:56 PM To: ctpp-news(a)chrispy.net Cc: Subject: [CTPP] Tutorial for CTPP 2000 browser thematic map,shapefile export? Is there a tutorial available for using the CTPP 2000 browser to conduct some real task? For example, "create a thematic map showing drive alone modeshare by census tract at place of work". When I try I get stuck in the selecting tables stage first (the list of available tables never makes sense), then again at the thematic map step (I can't figure out how to normalize by area, population density or number of workers in the tract). The tutorials on the CD describe only the user interface, not the steps needed to get a real task done. I'm hoping there is a way to export data into shapefile format, so maps can be made in GIS software. Is this possible? Bryce Nesbitt Note: I've found the browser to be slow, prone to crashing, and obtuse. Most annoying is that lots of windows can't be resized, yet one must scroll to read the longer titles. _______________________________________________ ctpp-news mailing list ctpp-news(a)chrispy.net http://www.chrispy.net/mailman/listinfo/ctpp-news

19 years

[CTPP] Tutorial for CTPP 2000 browser thematic map, shapefile export?

by Bryce W Nesbitt

Is there a tutorial available for using the CTPP 2000 browser to conduct some real task? For example, "create a thematic map showing drive alone modeshare by census tract at place of work". When I try I get stuck in the selecting tables stage first (the list of available tables never makes sense), then again at the thematic map step (I can't figure out how to normalize by area, population density or number of workers in the tract). The tutorials on the CD describe only the user interface, not the steps needed to get a real task done. I'm hoping there is a way to export data into shapefile format, so maps can be made in GIS software. Is this possible? Bryce Nesbitt Note: I've found the browser to be slow, prone to crashing, and obtuse. Most annoying is that lots of windows can't be resized, yet one must scroll to read the longer titles.

19 years

[CTPP] Census News Brief

by Ed Christopher

Census Bureau Recharters, Shrinks Decennial Census Advisory Committee; May meeting Postponed; Plus: Race/Ethnic, Professional Advisory Committees To Meet; New House Oversight Panel Schedules First Census Hearing; and more. The Census Bureau will reconstitute the Decennial Census Advisory Committee (DCAC) with fewer members, according to a notice in the Federal Register on March 21. The DCAC, whose charter expired, had 38 member organizations, as well as ex-officio members from Congress and the U.S. Postal Service. The Secretary of Commerce will appoint 20 member organizations to the new 2010 Census Advisory Committee (2010 CAC) and will designate its chair and vice chair. The committee will report to the Census Bureau director. The deadline for submitting nominations for membership was April 8. Members of the old DCAC were required to reapply for membership on the new committee. According to the Federal Register notice, the new advisory committee will advise the Census Bureau on how best to achieve its decennial goals and objectives and will address policy, research, and technical issues related to the design and implementation of the census. 2010 CAC members may not duplicate other organizations, interests, or communities already represented on other Census Bureau advisory committees or census consultation groups, such as Census Information Centers or State Data Centers. The Census Bureau said it is seeking members that are knowledgeable about issues related to the statutory and/or constitutional uses of the census data, general governmental entities, data users, and research and technology-based organizations. Several members of the now-defunct DCAC, including the NAACP and National Urban League, are Census Information Centers (CICs), a cooperative program between the Census Bureau and non-profit organizations established to represent the interests of underserved communities. Centers serve as repositories of census data and reports, making census information and data available to the public and the communities they serve. The Census Bureau also has five race and ethnic advisory committees, representing the interests of the African American, American Indian and Alaska Native, Asian, Hispanic, and Native Hawaiian and Other Pacific Islander communities. Individuals, not organizations, are appointed to these committees. In addition, the Census Advisory Committee of Professional Associations (CACPA) is comprised of representatives of the American Economic Association, American Marketing Association, American Statistical Association, and Population Association of America. The latter two associations were members of the DCAC. 2010 CAC member organizations will serve three year terms, after initial appointments of two or three years to stagger terms over the life of the committee. The next meeting of the decennial advisory committee, originally scheduled for May, has been postponed until sometime in the fall. Other census advisory committees to meet this month: The Census Bureaus five race and ethnic advisory committees (REAC) will meet on April 25-27 to review the status of planning for Census 2010 and the newly-launched American Community Survey (ACS). Topics of discussion include updates from congressional staff, status of 2010 census tests, accessing ACS data on the Census Bureaus web site, and Census Bureau research related to data quality, enumerating small populations, and reaching people whose primary language is not English. The Census Advisory Committees on the African American Population, American Indian and Alaska Native Population, Asian Population, Hispanic Population, and Native Hawaiian and Other Pacific Islander Population will meet jointly on April 25 from 9:00 AM 5:15 PM; on April 26 from 8:30 AM 4:30 PM (including concurrent sessions from 1:00 4:30 PM); and on April 27 from 9:00 AM 12:15 PM. The Census Advisory Committee of Professional Associations (CACPA) will meet April 21 from 8:30 AM 5:00 PM, and April 22 from 8:30 AM 12:15 PM. Agenda items related to Census 2010 and the ACS include plans for computer-assisted interviewing, proposed residence rules, group quarters definitions, and content tests (including race/ethnicity questions). All of the advisory committees will meet at the Sheraton Crystal City Hotel in Arlington, VA (tel. 703-486-1111). The meetings are open to the public. New Census Subcommittee to review plans for 2010: The House Subcommittee on Federalism and the Census has scheduled a hearing for Tuesday, April 19, to review the status of planning for Census 2010 halfway through the decade. Witnesses include Under Secretary (of Commerce) for Economic Affairs Kathleen Cooper; Census Bureau Director C. Louis Kincannon; Joan Naymark, Target Corporation, testifying for the U.S. Chamber of Commerce; Dr. Andrew Reamer, Urban Markets Initiative, The Brookings Institution; and Jacqueline Byers, National Association of Counties. The hearing will start at 10:00 AM in Room 2154 Rayburn House Office Building. Census legislation reintroduced in the House: Rep. Carolyn Maloney (D-NY), a member of the House census oversight subcommittee, has reintroduced two bills related to the census. Both bills were referred to the Committee on Government Reform. H.R. 337 would set a five-year term for the Census Bureau director. Currently, the director, who is nominated by the President and confirmed by the U.S. Senate, has no fixed term of service. Historically, directors have stepped down if a president from the opposing political party is elected. Some critics have charged that this arrangement leaves the position vulnerable to political influence. The heads of several other federal statistical agencies, including the Bureau of Labor Statistics, serve a fixed term of office, while career civil servants are in the top position at other agencies. H.R. 564, introduced with four cosponsors, would amend title 13, United States Code, to allow the use of statistical sampling in determining the population counts used for congressional reapportionment. Conflicting interpretations of section 195, which Rep. Maloneys bill would clarify, were central to a lawsuit filed by House Republicans before the 2000 census, challenging the Census Bureaus plan to use sampling methods as part of follow-up operations and to adjust the initial census numbers to correct for under- and overcounts. The U.S. Supreme Court ruled in January 1999 that section 195 of title 13 barred the use of sampling for apportionment purposes, forcing the Census Bureau to revise its census plan. Census News Briefs are prepared by Terri Ann Lowenthal, an independent consultant in Washington, DC, with support from The Annie E. Casey Foundation and other organizations. 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 202/484-3067 or by e-mail at TerriAnn2K(a)aol.com. Please feel free to circulate this document to other interested individuals and organizations. Information provided in Census News Briefs may be quoted without attribution. --------------- 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] Calculating Poverty Rate for all persons at residence

by Murakami

Dear Scott-- Poverty has already been calculated and in included on several CTPP tables. For PERSONS, at the RESIDENCE geography, CTPP2000 includes Table 1-059 Poverty status by Disability Status by Minority Status by Age. The universe is off "persons age 5 and over for whom poverty status has been determined." "Poverty" is a derived variable based on household size, income, and # of children under age 18, and age (65+ or not). http://www.census.gov/hhes/poverty/povdef.html If you want to define poverty differently than the CB has done, you would have to use the Census PUMS (microdata) file, and be limited to PUMA geography. Elaine Murakami FHWA Office of Planning 206-220-4460 -----Original Message----- From: ctpp-news-bounces(a)chrispy.net [mailto:ctpp-news-bounces(a)chrispy.net]On Behalf Of Scott Ferry Sent: Friday, April 15, 2005 8:49 AM To: CTPP News List Serve Subject: [CTPP] Calculating Poverty Rate for all persons at residence Hello, Could someone please guide me through the process of determining the poverty rate for all persons at residence using the CTPP 2000 data? Specifically, I need to know the tables and fields that need to be used. Many thanks, Scott Ferry Transportation Planner Regional Intergovernmental Council 315 D Street South Charleston, WV 25303

19 years

[CTPP] Calculating Poverty Rate for all persons at residence

by Scott Ferry

Hello, Could someone please guide me through the process of determining the poverty rate for all persons at residence using the CTPP 2000 data? Specifically, I need to know the tables and fields that need to be used. Many thanks, Scott Ferry Transportation Planner Regional Intergovernmental Council 315 D Street South Charleston, WV 25303

19 years

[CTPP] RE: TAZs and the 2010 Census

by Murakami

I received this email from Bob Paddock today, and thought that a reply to the listserv might be useful... -----Original Message----- From: Bob Paddock [mailto:bob.paddock(a)metc.state.mn.us] Sent: Thursday, April 07, 2005 12:14 PM To: Murakami, Elaine Subject: TAZs and the 2010 Census Elaine, If my question should be addressed to someone other than yourself, please let me know. I have been discussing the future of our agency's TAZ system with the person responsible for our travel demand modeling. Collectively we have wondered just how the TAZ system will be utilized for the 2010 Census and ACS survey data. Since we defined our TAZs in the past based on Census block aggregations, will such efforts be needed for the year 2010? If so, how will all of this work with the ACS? Any thoughts on this? BOB ------------From Elaine------ For purposes of this reply, I will assume that there will be a CTPP-like product from a 5-year accumulation of ACS data. 1. Census Bureau Geography Division is already planning to reserve two TAZ fields for TIGER for 2010 Census. Conceptually, these could be considered as a small "urban" TAZ, and a larger TAZ for statewide planning purposes. However.... 2. The sample sizes from the ACS are much smaller than for decennial census due to 2 main reasons: a. The sample size of 2.5 % per year * 5 years = 12.5% is less than the 16.6% (1:6 h.u. sampling rate) for the decennial census Long Form. (Original design of ACS was 3% per year, so that 3% * 5 years = 15% which is much closer to the 16.6% for LF) b. The ACS non-response follow-up is a sample of 1 in 3 (generally speaking), but higher in areas with low mail-back returns. c. Thus, in the ACS test areas, the actual number of unweighted survey records is 50-60% that of the Long Form. This smaller sample size means tabulations for small geographic units is highly variable and much less reliable, and may be subject to data suppression to protect individual confidentialy. This has implications for any TAZ-based tabulation, and has severe implications for any FLOW tabulation. Under the assumption that the CB retains the requirement of 3 unweighted records for FLOW tabulation (same as imposed on the CTPP 2000), we expect that about 40-50% of tract-to-tract flows would be suppressed. 3. What might be some alternatives? Would people want to define TAZs, based on census blocks, that are closer in size to a census tract? Would census tracts be sufficient as is? Would different TAZs be needed: one for Residence only and Workplace only tabulations, and ANOTHER larger TAZ for FLOW tabulation? Assuming that State DOTs and MPO still want to define TAZs, it would be safe to assume that we would use a GIS-based product similar to TAZ-UP for the CTPP 2000. One outcome may be that the TAZs in your MPO model are likely to be SMALLER than any geographic area tabulation you get from the ACS. You will have to figure out a way to distribute ACS results to your model's TAZs. 4. CB has a project called the LEHD http://lehd.dsd.census.gov/led/ They have been doing some exploration on generating small area home-to-work flows from this, but although this has characteristics like age, sex, earnings, it doesn't have mode to work, travel time, departure time. Also, multi-site businesses, government employment, and other issues on the workplace geography are still being researched. My personal opinion is that there are probably issues on the residence geography as well, e.g. particularly areas with "transient" populations such as students, snowbirds, and migrant laborers. 5. And, of course, we haven't even discussed the quality of the workplace geocoding, so there are plenty of things beyond TAZ definition that need to be addressed regarding a CTPP from ACS. If you haven't planned yet to come to the TRB Census conference (May 11-13), now is the time to sign up! http://www.trb.org/conferences/censusdata/ Elaine Murakami FHWA Office of Planning 206-220-4460 in Seattle

19 years

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CTPP April 2005