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2560 discussions

by Ed Christopher

Our friends (who I do not know) at the Bureau of Economic Analysis who do the Regional Economic Accounts revamped their historic (1970, 1980, 1990 and 2000) Journey to Work (JTW) data base and put a nice search engine to it. For years I have sent people to the BEA sight for JTW flows but with the new search engine and the 2000 data it is so easy to use. For 2000 they have added flows by major industry at the county level and by minor industry at the state level. You really need to check it out. http://www.bea.gov/bea/regional/reis/jtw/ But then there is the nagging issue. Why do my historic CTPP/UTPP numbers and BEA not match. In 1970 and 1980 the two sources look to be off in different directions, but for 1990 they match and for 2000 it looks like a small rounding difference. Getting into the detail, attached is a comparison of the BEA/CTPP-UTPP numbers for Cook county IL, specifically the Cook to Cook flows. In 1980 BEA is about 2K higher out of 2M, but in 1970 BEA is in the neighborhood of 200K low. I know this keeps coming up, but why? Is the pattern the same around the country, BEA is high in 1980 and low in 1970? At some point we may need to reconcile all this and pick one series or the other. Since I have been tracking the Chicago region numbers (http://www.berwyned.com/papers/co2cochgo.pdf) for quite some time this has always been a nagging headache. How do all the numbers compare in your counties? Does anyone remember why the 70s and 80s might not match? (please reply to all) -- Ed Christopher 708-283-3534 (V) 708-574-8131 (cell) FHWA RC-TST-PLN 19900 Governors Dr Olympia Fields, IL 60461

17 years, 10 months

IPUMS to access 2005 ACS microdata

by Murakami, Elaine

Sorry! I hit the "send" button instead of "save." I guess I am having a BAD DAY with email and the CTPP listserv. The IPUMS site http://usa.ipums.org/usa/sda/ provides an on-line table generator using the 2005 ACS public use microdata sample, that also allows for other statistical tests such as correlation, multiple regression, logit/probit regression. It provides a way to create new variables. And it is FREE! So, if the Census Bureau is not including the table YOU want in their standard set, you can create your own table with this tool. For example, in CTPP, we have a variable called "Means of Transportation to Work." However, in the microdata, this is two questions: How did this person usually get to work LAST WEEK? List of methods. How many people, including this person, usually rode to work in the car, truck or van, LAST WEEK? __ persons To separate "drive alone" from "carpool" you will need to use both variables: TRANWORK and CARPOOL The Public Use Microdata Sample is a SAMPLE of the ACS sample records, so this is going to be useful mostly for large geographic units, or national analysis. So, going back to my earlier email about "year of entry", I could use the IPUMS to analyze the Census 2000 and the 2005 ACS data, and use the values to create a new variable. Hope this is of interest to at least some of you! Have a GREAT WEEKEND! Elaine

17 years, 11 months

IPUMS to access 2005 ACS microdata

by Murakami, Elaine

http://usa.ipums.org/usa/sda/

17 years, 11 months

Second try: Year of Entry and Start thinking about next CTPP Table design

by Murakami, Elaine

I had an interesting discussion with Alan Pisarski yesterday and wanted to share some of it with everyone. Alan, along with other researchers including Dowell Myers at USC, and Evelyn Blumenburg at UCLA, have examined how time since immigration influences transit mode choice and vehicle acquisition. First, let's remember that there are "standard" tables that the Census Bureau produces, and there are "custom" tables done on commission. The 1990 and 2000 CTPP are "custom" tabulations. The "standard" tabulations come out BEFORE any "custom" products. The questions on the ACS form are: 8. Is this person a CITIZEN of the United States? 9. When did this person come to live in the United States? Year _______ The current ACS standard products, such as profile S0502 use the specific year in the table: Entered 2000 or later Entered 1990 to 1999 Entered before 1990 While this approach can be useful for cohort analysis, it is less useful for understanding mode choice by time spent in the U.S. For the CTPP2000, we had the Census Bureau create a variable called "Length of U.S. residence." The CTPP 2000 includes Table1-020 Length of U.S. residence by Means of Transportation to Work. One way to think about this is to consider "year of birth" and the variable "age." If a person is born in 1960, and is surveyed in 2005, their age is tabulated as 45. If they are surveyed in 2010, their age is tabulated as 50. If the tabulation was by "year of birth" they would always show up in the category "1960." Alan wants to make sure he gets the equivalent of CTPP2000 Table 1-020 with the ACS tabulations, and have it reported for metropolitan areas, and aggregated by metro areas by population size. So, this is an opportunity for me to bring up the topic of TABLE DESIGN for the next CTPP! We plan for the first product of the next CTPP to use the first three years of ACS data (2005/2006/2007). The tabulation will be limited to geographic units with population over 20,000. Also, Phil Salopek has already submitted a list of tables to be deleted from the ACS standard set. This includes profile S0803, and tables of travel time by marital status, travel time by educational attainment, and travel time by household type. He also had travel time by race and ethnicity on the list for deletions, but I asked if he could retain them as they are useful for projects on environmental justice. IF THERE ARE SPECIFIC TABLES (particularly those related to journey to work and vehicle availability) that you MUST have as part of the ACS "standard" set, please let me know ASAP, so that we can convey this to the CB. If there are tables that you especially want for the first CTPP product, please convey those ideas as well. On MY list for the first CTPP product are: County-to-County flow tabulation (total, and by means of transportation to work) PUMA-to-PUMA flow tabulation (total and by means of transportation to work) However, for flow tabulations from ACS, we need to make sure that the workplace allocation program is in place to assign detailed workplace geocoding to respondents who do not supply sufficient information on their ACS form. Finally, for those of you who do not already know, Phil Salopek will be retiring from the U.S. Census Bureau on March 2. He has been a great help to all of us in the transportation data community and we wish him well in his new endeavors, and we hope that he will find a way to continue to work with us! On behalf of the CTPP Team: Elaine Murakami 206-220-4460

17 years, 11 months

"Year of Entry" tabulation in ACS

by Murakami, Elaine

17 years, 11 months

Re: [CTPP] CENSUS

by Ed Christopher

Dan, I am responding to the whole list because of the importance of your question. The very short answer is no, but.... There always is a but. In terms of specific work it is looking like TAZ development will not take place until late summer/fall 2008. Coming just before TAZ development will be a Census program to redifine Tracts and Block Groups. The organizational and technical processes for defining these geographies will be different. Regarding the organizational process ie who developes the boundaries, the Census Bureau is overhauling the old arrangements. They will be calling for broader participation of regional and local agencies, and FHWA will be encouraging the MPOs and state DOTs to be engaged in the process. This has been done to varying degrees in the past. The CB is also developing a software approach which I would like to think we in CTPP land helped pioneer with our 2000 TAZ-UP software. Before I get to far ahead of myself, the point is that it would be wise to plan on some staff time through out calendar 2007 for staying plugged in and preparing for what is to come. Having budgeted some staff time will also allow time for looking and learing how to work with ACS data. This is becoming ever so more important with data being released every year. However, in the middle to the end of 2008 the bulk of more techincal work in terms of TAZ (and other geography) deffinition will be upon us. Also, remember that the first 3-year data (tables for areas with more that 20,000 people) will begin coming out in August 2008. Next year, August of 2007, you will still have the tables for areas over 65,000 people like you did this year. Another consideration is the AASHTO CTPP pooled fund. ASHTO is just now finishing up on getting all the committment letters for the states so that the planning work, research, training materials and the devleoplment of customized data products can start moving in preperation and onset of ACS data and activities. Regarding the pooled fund (or consolidated purchase as some call it) in some states the state DOT might be requesting the MPOs to pick up a share of the cost. This would have to be bugeted for ASAP. So far, I only know of only one state that might be doing this, California. Indiana has already signed the commitment letter and is on board. For more infoation on the poled fund and what each state has been asked to pony up see http://www.TRBcensus.com/SCOP/docs/pooled_fund/pooled-fund.pdf. For even more detail on the consolidated purchase se http://www.TRBcensus.com/SCOP/ you will find more detail on the pooled fund. Let me stop here in case I raised more questions that people want to ask and before I confuse the matter. Dan Avery wrote: > > Ed, > Are there any activities that MPO's should be including > in their UPWPs regarding assistance to the Census > Bureau in FY 08 (July 2007 to June 2008)? In the past > we have assisted with address files, journey to work > info, tract and block group boundaries, etc. and we are > often caught in mid-year without appropriate funding > identified in our UPWP. Do you know what activities may > be planned for this time period? Thanks for any > assistance and information. > > Dan Avery > Co-Chair Indiana MPO Council > > Dan Avery > Executive Director, NIRCC > 260.449.7309 > fax 260.449.7682 > dan.avery(a)co.allen.in.us -- Ed Christopher 708-283-3534 (V) 708-574-8131 (cell) FHWA RC-TST-PLN 19900 Governors Dr Olympia Fields, IL 60461

17 years, 11 months

CENSUS NEWS FLASH

by Ed Christopher

Good morning, census stakeholders. Brief update on Census Bureau funding for Fiscal Year 2007.Thanks, Terri AnnTerri Ann Lowenthal Legislative & Policy Consultant 1250 4th St., SW Apt. W615 Washington, DC 20024 (tel.) 202-484-3067 TerriAnn2K(a)aol.com ***************************

17 years, 11 months

Census News Brief

by Ed Christopher

Hello, census stakeholders. Attached please find the latest Census News Brief, with information on the President's 2008 budget request for the Census Bureau and other issues related to the 2010 census. Thanks for your continued interest. Happy Valentine's Day! Terri Ann Terri Ann Lowenthal Legislative & Policy Consultant 1250 4th St., SW Apt. W615 Washington, DC 20024 (tel.) 202-484-3067 TerriAnn2K(a)aol.com ***************************

17 years, 11 months

MORE Transportation Profiles using the 2005 ACS

by Murakami, Elaine

The AASHTO webpage on CTPP Profiles has been updated. http://ctpp.transportation.org/2005.htm There are 3 different sets, the second and third sets are the "new" ones, and are based on the October 2006 release of 2005 ACS data. The same cautions about interpreting the results from ACS, compared to decennial Census remain the same. http://ctpp.transportation.org/production/notes/notes.htm -The first set is by Place of Residence. (We posted these several months ago). Probably, we will need to go back and add more geography to this set. -The second set is also by Place of Residence and tabulates WORKERS and HOUSEHOLDS by household characteristics such as HOUSEHOLD SIZE and VEHICLE AVAILABILITY. -The third set is by Place of Work. We do not have "metropolitan areas" here, since the results are going to be nearly the same as for Place of Residence. However, we included "State" totals, even if they are also going to look very similar to Place of Residence tabulations (except Washington, D.C.) These are "DRAFT" and we plan to add more information about Margins of Error (in NUMBERS), where it currently is limited to MOE in percent. These profiles will be posted as FHWA 508-compliant HTML in the near future. I haven't found the time to finish a "highlights" document similar to the one I did for the first set of profiles. Also, we have added several links to our ACS page, including links to web-based training. A good starting point for learning about using American FactFinder to access ACS data, please see the Ken Bryson archived webinar. http://www.fhwa.dot.gov/planning/census/acs.htm Nanda Srinivasan (now on vacation until March 2) did the hard work in producing these profile sheets. On behalf of the CTPP Team: Elaine Murakami FHWA Office of Planning 206-220-4460

17 years, 11 months

Using CTPP in influenza pandemic models and other purposes

by Murakami, Elaine

One of the things I like to track is how are people using the CTPP and the NHTS. Here are a few new applications! The January 2007 issue of Geoworld www.geoplace.com <http://www.geoplace.com/> includes an article about a Department of Homeland Security (DHS) project conducted by Los Alamos National Laboratory on simulating the spread of pandemic influenza. This model uses the tract-to-tract home-to-work flow data from CTPP2000 Part 3, along with long distance trip information from 2001 NHTS. The article notes that "previous epidemic models created in the 1970s were based on a single community model without spatial information." Oak Ridge National Labs is conducting a project for Transportation Security Administration where CTPP2000 Part 2 (workplace) at the block group and TAZ level is part of the equation for estimating daytime and nighttime populations. After placing workers at work locations, they distribute school age students to schools, colleges and universities, and others to hospitals. They use the NHTS data for estimating populations who stay at home. They currently do not try to model individual trips to shopping or other retail destinations. For more information, please contact Pat Hu at hups(a)ornl.gov Cities21 has been mapping labor market sheds using the CTPP2000 Part 2 data for an Environmental Protection Agency study "Transforming Office Parks into Transit Villages." They have identified 17 San Francisco Bay Area suburban major employment centers. Each center has at least 15,000 jobs. http://www.cities21.org/BABPC/ <http://www.cities21.org/BABPC/bizParksDetail.htm> For more information, please contact Steve Raney at cities21(a)cities21.org <mailto:steve_raney@cities21.org> . One of the reasons that I've heard that CTPP2000 has been used in these studies is that there is nationwide coverage with small geographic detail, and that it is "free." But it isn't free! The CTPP for 1990 and 2000 have been special tabulations commissioned by the transportation data community, particularly the State DOTs and MPOs via an AASHTO consolidated purchase. There have been discussions in the past about whether or not to charge for copies of data, but most recently, with the CTPP2000, it was decided that setting up charging and reimbursement systems would not be worthwhile. That is why the data were distributed FIRST to the State DOTs and MPOs who paid for the data products, but also why there are no licensing agreements on use and distribution of the data. One of the contributions from BTS for the CTPP2000 was to provide public on-line data access through the TranStats webpage and the "bookstore" for CD distribution. If you are doing some interesting work using the CTPP, please share it here on the CTPP listserv, or contact me at Elaine.murakami(a)fhwa.dot.gov and we can discuss an article for a future issue of the CTPP Status Report. http://www.fhwa.dot.gov/ctpp/status.htm The January 2007 issue is now available. Elaine Murakami FHWA Office of Planning 206-220-4460 (in Seattle)

17 years, 11 months

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