CTPP December 2010

ctpp@listserv.transportation.org

21 participants
20 discussions

RE: [CTPP] ACS 2005-09 Block Group level stats

by Graham

I agree with Patty Becker that the Block Group-level stats are shaky. I'd posted on this question to the Census SDC listserv a few months back. I'll share it here (CTPP list) as well... According to Chapter 3 of the Bureau's ACS Design and Methodology, the "frame" for ACS 2005-09 is still the Census 2000 MAF with five kinds of POST-2000 maintenance. (So the frame for the ACS data released this Fall is not the 2010 MAF.) If I understand Chapter 11, Census has taken some steps as Census Tract-level quality control. Still Tract totals are simply the Tract-level frame counts from the MAF, validated with administrative data counts. See http://www.census.gov/acs/www/Downloads/survey_methodology/acs_design_metho… for details (starting on page 11.17) As for Block Groups... ACS housing unit totals, pop totals, and other data for Block Groups are simply BG-level sums of weights of cases that happen to be geolocated within the BG. Beyond that, Block Groups are unaddressed in the control total and weighting methodology. So there’s great potential, from a research design standpoint, for screwy results at BG-level. Bottom line: Yes, the BG-level numbers you see in ACS 2005-09 are very shaky. And the ACS 2006-10 data that will be released 12 months from now -- with all the raw survey-collected data re-weighted -- could look very different at Block Group level. ________________________ Todd Graham Principal Forecaster Metropolitan Council 390 Robert Street North Saint Paul, MN 55101 ph: 651/602-1322 email: todd.graham(a)metc.state.mn.us<mailto:todd.graham(a)metc.state.mn.us> in: www.linkedin.com/in/toddgraham web: http://stats.metc.state.mn.us/ ________________________ From: ctpp-news-bounces(a)chrispy.net [mailto:ctpp-news-bounces(a)chrispy.net] On Behalf Of Lindeman, Nicholas (MPO) Sent: Tuesday, December 14, 2010 10:42 AM To: ctpp-news(a)chrispy.net Subject: RE: [CTPP] ACS 2005-09 comparisons with 2000 SF3 Does anyone know why the Block Group data is not being released via the AFF’s standard pull-down menus? I was under the impression that today (12/14) was the release date for this data. I understand that it is available via Summary File, but this is far from user friendly. When will the data be available via the AFF’s standard access method? Thank you, Nick Lindeman Nicholas Lindeman Economic & Systems Data Analyst Nashville Area MPO 800 2nd Ave. S. P.O. Box 196300 Nashville, TN 37219-6300 (615) 862-7198 lindeman(a)nashvillempo.org http://www.nashvillempo.org<http://www.nashvillempo.org/> From: ctpp-news-bounces(a)chrispy.net [mailto:ctpp-news-bounces(a)chrispy.net] On Behalf Of Elaine.Murakami(a)dot.gov Sent: Tuesday, December 07, 2010 4:15 PM To: ctpp-news(a)chrispy.net Subject: FW: [CTPP] ACS 2005-09 comparisons with 2000 SF3 Correction to my earlier email: 2005-2009 ACS Block Group data WILL be released on December 14. From: brian.mckenzie(a)census.gov [mailto:brian.mckenzie(a)census.gov] Good Afternoon Mara and Elaine, The summary file data (block group level data) will be available on December 14th. You can use American Factfinder as a portal. You will be able to download summary file data via the FTP website at <http://www2.census.gov/acs2009_5yr/summaryfile/>. There will also be a clickable link next to the familiar portion of AFF in which you select the desired ACS year(s) for which you would like data. Hope this helps. Brian McKenzie Analyst, Journey to Work and Migration Statistics Branch U.S. Census Bureau 301-763-6532 brian.mckenzie(a)census.gov

14 years, 7 months

RE: [CTPP] ACS 2005-09 comparisons with 2000 SF3

by Patty Becker

In my opinion, the bureau has absolutely made the right decision in keeping the block group data off of AFF. I recommended this course of action several years ago. The error levels are WAY too high for casual users, and power users can easily download the file and do what they need to do. Patty Becker At 01:01 PM 12/14/2010, you wrote: >The direct answer to Nick is that the block >group data will NOT be posted in American >Factfinder, and will ONLY be available in Summary File format. > >Ed's response was about reasons why the Census chose this differentiation. > >Elaine Murakami >FHWA Office of Planning > > >-----Original Message----- >From: ctpp-news-bounces(a)chrispy.net on behalf of edc(a)berwyned.com >Sent: Tue 12/14/2010 12:24 PM >To: ctpp-news(a)chrispy.net >Subject: RE: [CTPP] ACS 2005-09 comparisons with 2000 SF3 > >This is one of those points of speculation and spin. If you ask the CB >the official line will be that it is so big and contains literally >mountains of tables that it is impractical to serve up with an online >search engine. They will tell you that comments on this were asked for in >the Federal Register and there was not a huge outcry. However, if you >"put your ear to the ground" you will hear some speculate that it is >because the tables are so hard to work with due to confidentiality >suppression and large margins of errors that the CB wanted to keep the >data from the "novice" user. As one noted user put it, "they are putting >the data on the top shelf just out of reach of the kids." > >What would be of use here is for people who have begun to work with it to >share their experiences. > >Form the CB press release today... >The U.S Census Bureau is pleased to announce the release of the 2005-2009 >American Community Survey (ACS) 5-year estimates on American FactFinder. >There you will find tables with social, demographic, housing, and economic >data for areas down to the census tract level. > >You can access the newly-released data on American FactFinder at: >2005-2009 ACS 5-year data >http://factfinder.census.gov/servlet/DatasetMainPageServlet?_program=ACS&_s… > > > > > > > > Does anyone know why the Block Group data is not being released via the > > AFFâ?Ts standard pull-down menus? I was under the impression that today > > (12/14) was the release date for this data. I understand that it is > > available via Summary File, but this is far from user friendly. > > > > > > > > When will the data be available via the AFFâ?Ts standard access method? > > > > > > > > Thank you, > > > > Nick Lindeman > > > > > > > > Nicholas Lindeman > > Economic & Systems Data Analyst > > > > Nashville Area MPO > > 800 2nd Ave. S. > > > > P.O. Box 196300 > > Nashville, TN 37219-6300 > > (615) 862-7198 > > lindeman(a)nashvillempo.org > > http://www.nashvillempo.org <http://www.nashvillempo.org/> > > > > > > > > > > > > > > > > From: ctpp-news-bounces(a)chrispy.net [mailto:ctpp-news-bounces(a)chrispy.net] > > On Behalf Of Elaine.Murakami(a)dot.gov > > Sent: Tuesday, December 07, 2010 4:15 PM > > To: ctpp-news(a)chrispy.net > > Subject: FW: [CTPP] ACS 2005-09 comparisons with 2000 SF3 > > > > > > > > Correction to my earlier email: 2005-2009 ACS Block Group data WILL be > > released on December 14. > > > > > > > > From: brian.mckenzie(a)census.gov [mailto:brian.mckenzie(a)census.gov] > > > > Good Afternoon Mara and Elaine, > > The summary file data (block group level data) will be available on > > December 14th. You can use American Factfinder as a portal. You will be > > able to download summary file data via the FTP website at > > > <http://www2.census.gov/acs2009_5yr/summaryfile/ > > <http://www2.census.gov/acs2009_5yr/summaryfile/> >. There will also be a > > clickable link next to the familiar portion of AFF in which you select the > > desired ACS year(s) for which you would like data. Hope this helps. > > > > Brian McKenzie > > Analyst, Journey to Work and Migration Statistics Branch > > U.S. Census Bureau > > 301-763-6532 > > brian.mckenzie(a)census.gov > > > > > > > > _______________________________________________ > > ctpp-news mailing list > > ctpp-news(a)chrispy.net > > http://www.chrispy.net/mailman/listinfo/ctpp-news > > > > >_______________________________________________ >ctpp-news mailing list >ctpp-news(a)chrispy.net >http://www.chrispy.net/mailman/listinfo/ctpp-news > > > >_______________________________________________ >ctpp-news mailing list >ctpp-news(a)chrispy.net >http://www.chrispy.net/mailman/listinfo/ctpp-news ------------------------------------------------------------------------------------------------- Patricia C. (Patty) Becker 248/354-6520 APB Associates/SEMCC FAX 248/354-6645 28300 Franklin Road Home 248/355-2428 Southfield, MI 48034 pbecker(a)umich.edu

14 years, 7 months

RE: [CTPP] ACS 2005-09 comparisons with 2000 SF3

by edc＠berwyned.com

1> Does anyone know why the Block Group data is not being released via the > AFFâs standard pull-down menus? I was under the impression that today > (12/14) was the release date for this data. I understand that it is > available via Summary File, but this is far from user friendly. > > > > When will the data be available via the AFFâs standard access method? > > > > Thank you, > > Nick Lindeman > > > > Nicholas Lindeman > Economic & Systems Data Analyst > > Nashville Area MPO > 800 2nd Ave. S. > > P.O. Box 196300 > Nashville, TN 37219-6300 > (615) 862-7198 > lindeman(a)nashvillempo.org > http://www.nashvillempo.org <http://www.nashvillempo.org/> > > > > > > > > From: ctpp-news-bounces(a)chrispy.net [mailto:ctpp-news-bounces(a)chrispy.net] > On Behalf Of Elaine.Murakami(a)dot.gov > Sent: Tuesday, December 07, 2010 4:15 PM > To: ctpp-news(a)chrispy.net > Subject: FW: [CTPP] ACS 2005-09 comparisons with 2000 SF3 > > > > Correction to my earlier email: 2005-2009 ACS Block Group data WILL be > released on December 14. > > > > From: brian.mckenzie(a)census.gov [mailto:brian.mckenzie(a)census.gov] > > Good Afternoon Mara and Elaine, > The summary file data (block group level data) will be available on > December 14th. You can use American Factfinder as a portal. You will be > able to download summary file data via the FTP website at > <http://www2.census.gov/acs2009_5yr/summaryfile/ > <http://www2.census.gov/acs2009_5yr/summaryfile/> >. There will also be a > clickable link next to the familiar portion of AFF in which you select the > desired ACS year(s) for which you would like data. Hope this helps. > > Brian McKenzie > Analyst, Journey to Work and Migration Statistics Branch > U.S. Census Bureau > 301-763-6532 > brian.mckenzie(a)census.gov > > > > _______________________________________________ > ctpp-news mailing list > ctpp-news(a)chrispy.net > http://www.chrispy.net/mailman/listinfo/ctpp-news >

14 years, 7 months

FW: [CTPP] ACS 2005-09 comparisons with 2000 SF3

by Elaine.Murakami＠dot.gov

Correction to my earlier email: 2005-2009 ACS Block Group data WILL be released on December 14. From: brian.mckenzie(a)census.gov [mailto:brian.mckenzie(a)census.gov] Good Afternoon Mara and Elaine, The summary file data (block group level data) will be available on December 14th. You can use American Factfinder as a portal. You will be able to download summary file data via the FTP website at <http://www2.census.gov/acs2009_5yr/summaryfile/ <http://www2.census.gov/acs2009_5yr/summaryfile/> >. There will also be a clickable link next to the familiar portion of AFF in which you select the desired ACS year(s) for which you would like data. Hope this helps. Brian McKenzie Analyst, Journey to Work and Migration Statistics Branch U.S. Census Bureau 301-763-6532 brian.mckenzie(a)census.gov

14 years, 7 months

[CTPP] TAZ delineation software: update on process

by Elaine.Murakami＠dot.gov

To State DOTs and MPOs who will be delineating TAZs and TADs for the CTPP: Many of you have been sending corrections to the TAZ contact databases over the last couple of weeks. Thanks so much for your attention to this matter. If you haven't done so already, please convey your changes/updates to Ms Liang Long, liang.long(a)dot.gov The Census Bureau Geography Division has told us that they are likely to use a data download system to transmit the TAZ delineation software and the county files to you. This system will be password protected. There will still be some agencies for which this approach may not be feasible, and in those cases, a mailout will be used instead. Don't forget the workshop on ACS data at TRB annual meeting, on Sunday, January 23 at the Hilton, Columbia Hall 6 from 9:00 a.m. - noon. Hope to see you there. Elaine Murakami FHWA Office of Planning 206-220-4460

14 years, 7 months

[CTPP] ACS 2005-09 comparisons with 2000 SF3

by Elaine.Murakami＠dot.gov

Nathan Erlbaum of NY State DOT has provided some links that may help you when the first small area data are released from the ACS (2005-2009). Note: the smallest geographic unit will be census tract (2000 geography). Block Group data will be released later in Summary File format. From: Erlbaum, Nathan (DOT) [mailto:nerlbaum(a)dot.state.ny.us] Sent: Tuesday, December 07, 2010 5:01 AM Subject: FW: ACS 2005-09 comparisons with 2000 SF3 FYI. This may help next week when the 5-year ACS data are released. It appears that the Census Bureau has updated its guidelines for comparing the 5-year 2005-09 ACS data to 2000 data. When I checked this link today (http://www.census.gov/acs/www/guidance_for_data_users/comparing_2009/), I noticed that it included the 5-year data, which had been missing when I last checked just a week or so ago. Also, the Bureau provides a variable-specific drill-down tool here: http://www.census.gov/acs/www/guidance_for_data_users/2009_table_comparison… Pretty neat.

14 years, 7 months

[CTPP] Developing Transportation Data Products from the American Community Survey That Comply With Disclosure Rules -- Call for Second Phase Research Test Sites

by Roisman

Dear Colleagues (apologies for cross-posting for those who also subscribe to TMIP-L), The study team for NCHRP 8-79 (Developing Transportation Data Products from the American Community Survey That Comply With Disclosure Rules) is looking for small and medium-sized MPOs to participate in the second phase of research into the impact of disclosure-avoidance techniques on the resulting data usability for transportation planning and travel demand modeling of the 5-year ACS-based CTPP tabulations. The team is interested both in small and medium-sized MPOs who maintain their own travel demand forecasting models, and MPOs who perform sketch-planning modeling using the methods from NCHRP Report 365. Participation would include production of a nominal amount of travel model output. Please contact me off-list at rroisman(a)vhb.com<mailto:rroisman(a)vhb.com> if you represent a small or medium-sized MPO and would like to assist the research effort, or know of some good candidate agencies. Thank you for your time. -Rich Roisman Richard I. Roisman, AICP Senior Transportation Planner VHB | Vanasse Hangen Brustlin, Inc. Transportation | Land Development | Environmental Services 8300 Boone Boulevard, Suite 700 Vienna, VA 22182 Phone: 703.847.3071 x5233 | Fax: 703.847.0298 | Mobile: 202.744.2377 rroisman(a)vhb.com<mailto:RRoisman(a)VHB.com> www.vhb.com<http://www.vhb.com/> This communication is confidential and intended only for the recipient(s). Any other use, dissemination, copying, or disclosure of this communication is strictly prohibited. If you have received this communication in error, please notify us and destroy it immediately. Vanasse Hangen Brustlin, Inc. is not responsible for any undetectable alteration, transmission error, conversion, media degradation, software error, or interference with this transmission. Vanasse Hangen Brustlin, Inc. | 101 Walnut St | Watertown, MA 02472 | 617.924.1770

14 years, 7 months

[CTPP] 5-year ACS is coming December 14th

by Ed Christopher

The reference webinar is for the media but when I went to the web page it appeared that anyone could join. ---------------------------- American Community Survey 2005-2009 American Community Survey 5-Year Estimates -- On Dec. 14, at 9a.m. EST, the Census Bureau will hold a Web conference to present data covering more than 40 topics, such as income, poverty, educational attainment, commute to work, foreign-born population, language spoken at home, ancestry, occupation, number of vehicles available and housing costs. These estimates will be available for the nation, all 50 states, the District of Columbia, Puerto Rico, congressional districts, counties, places and metropolitan areas and census tracts and block groups. There will be a pre-release technical webinar Dec. 8. Media advisory: <http://www.census.gov/newsroom/releases/archives/american_community_survey_…> -- Ed Christopher 708-283-3534 (V) 708-574-8131 (cell) FHWA RC-TST-PLN 4749 Lincoln Mall Drive, Suite 600 Matteson, IL 60443

14 years, 7 months

[CTPP] Enhanced 2009 NHTS data (Version2)

by Elaine.Murakami＠dot.gov

Hi Everyone - at the risk of redundant postings, I am forwarding notice that the new and improved 2009 NHTS dataset has been released and is available at the ORNL webpage listed below. Last week (Dec 1-2) there was a server crash, which prevented people from accessing the new data, but things are working more smoothly today (I tested it). I highly recommend using the user-friendly on-line table generator for simple analyses. It will automatically use the correct weights. You can start with a "frequently asked for" table, click on the "wrench" symbol, and then modify the table, e.g. to subset for a specific geographic area. For example, by clicking on variable descriptors and values, the software will create code such as HHSTATE EQ "FL" to limit the table to only records in Florida. Have fun! For additional information about the NHTS, please contact Adella Santos, the NHTS Program Manager Adella.santos(a)dot.gov Elaine Murakami FHWA Office of Planning From: National Household Travel Survey [mailto:nhts(a)email.ornl.gov] Sent: Wednesday, December 01, 2010 7:02 AM To: nhts(a)email.ornl.gov Subject: [NHTS] Enhanced 2009 NHTS data (Version2) The Federal Highway Administration is pleased to announce the availability of the enhanced 2009 NHTS data (Version2) for the transportation community and the public. For the last 6 months, the enhancement team has worked with all partners and all involved to deliver this enhanced version of data for both national coverage and add-on localities. The enhancement of the original V1.0 data was centered on methods of processing outliers; and at the same time, FHWA capitalized on the opportunity to use the 2008 ACS for population totals which was not available during the preparation of Version 1.0. The V2.0 data file is now available on the Online Analysis Tool for your use and to download (http://nhts.ornl.gov/ ). In the following weeks FHWA will also append the Nielsen's Claritas neighborhood characteristics data and the fuel consumption (MPG) data from the Energy Information Administration as an added value to V2.0. The Code Book browser and the User Guide will be updated and available by early December. Adella Santos, FHWA NHTS Program Manager Travel Monitoring & Survey Division FHWA, Office of Highway Information 1200 New Jersey Avenue, SE Room E83-426 Washington, DC 20590 202-366-5021

14 years, 7 months

[CTPP] the archive of CTPP listserv messages, and other news

by Elaine.Murakami＠dot.gov

Today, I got a query of where to find older CTPP messages, and I thought it might be useful to everyone. Here is the link: http://www.trbcensus.com/maillist.html For those of you who are State DOT and MPOs, don't forget that your updates/corrections to the TAZ delineation contact list are due to Ms. Liang Long liang.long(a)dot.gov by December 10. The lists are posted at on the AASHTO CTPP page: http://ctpp.transportation.org/Pages/taz.aspx We need to provide the complete list to the Census Bureau Geography Division in a couple of weeks, so your prompt attention to this is most appreciated. Hope to see some of you at TRB in Washington, DC. Also, hope to see you in Reno at the TRB Conference on Transportation Planning Applications. We will have a data workshop on Sunday May 8, 2011. http://www.trb-appcon.org/index.html Registration is not yet open. Elaine Murakami FHWA Office of Planning 206-220-4460 (in Seattle)

14 years, 8 months

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CTPP December 2010