Here is a link to the Census "long form" which includes the "journey to work" questions.
http://www.census.gov/dmd/www/pdf/d02p.pdf
Yes, it only the trip TO work. And, yes, you can double it to approximate a "round trip." Results from the National Household Travel Survey (NHTS) http://nhts.ornl.gov/2001/index.shtml show that many more people STOP on their way home from work, we call this "trip chaining." Results from the 1995 NPTS show that 60% of women, and nearly 50% of men make a stop on their way from work to home. So, the result is the that trip from work to home, including one or 2 stops is often considerably longer than the trip TO work.
http://www-cta.ornl.gov/npts/1995/Doc/Chain2.pdf
Thank you for sharing the Arbitron application. You may also be interested in the county-level CTPP profiles that were released last October. http://www.fhwa.dot.gov/ctpp/dataprod.htm
These have a few tables, including comparisons to 1990 results, and tables of commute time by mode of travel, and vehicle availability by household size. This same link also has information on the Census Bureau's County-to-County worker flow data.
The CTPP Part 1 (residence) tables will begin release in a few weeks. They will be mailed initially to the State DOTs and MPOs for their review, before they are released broadly and publicly.
Elaine Murakami
Federal Highway Administration
206-220-4460
I need to get more information on the Journey to Work questions. Can you
help me understand why only the one-way home-to-work trip is asked for? Why
not the return trip? Is it correct to double the Census travel times to
generalize "the average worker spends 51 minutes a day commuting?" I would
appreciate your input.
The questions arise because we posted the Census data on our web site. We
aggregated the data to our geographies and to a more manageable number of
categories. As you can imagine; radio stations, outdoor advertising
companies, and their ad agency and advertiser clients are very interested in
commuting info. If you are interested, you can see the application at
<http://www.arbitron.com/radio_stations/transportation.htm>
http://www.arbitron.com/radio_stations/transportation.htm.
Dan Estersohn
Senior Demographer
Arbitron, Inc
TO: CTPP-News; Nathan
There were some slight problems in the PDF and WORD files I uploaded to our FTP site. So, I re-up-loaded them to our FTP site, as well as our HTTP (hypertext transfer protocol - - web page) site:
ftp://ftp.abag.ca.gov/pub/mtc/census2000/ACS/ACS_Hearing_MAY1303/http://www.mtc.ca.gov/datamart/census/acs/
If the FTP doesn't work, there may be a "firewall" issue. I wouldn't know if it's from our end or your end. Perhaps your systems administrator could tell.
An any case, I've made duplicates of the same file at the http url, shown above.
Maybe Ed and I can update trbcensus.com to add links to these documents on the ACS page?
Chuck Purvis
**************************************************************
Charles L. Purvis, AICP
Principal Transportation Planner/Analyst
Metropolitan Transportation Commission
101 Eighth Street
Oakland, CA 94607-4700
(510) 464-7731 (office)
(510) 464-7848 (fax)
www: http://www.mtc.ca.gov/
Census WWW: http://www.bayareacensus.ca.gov/
**************************************************************
TO: CTPP-News
For the benefit of the CTPP community, I've uploaded all of the testimonies (PDF, Word) from the May 13, 2003 Congressional Subcommittee meeting regarding the American Community Survey, onto our FTP site.
The files are available at:
ftp://ftp.abag.ca.gov/pub/mtc/census2000/ACS/ACS_Hearing_MAY1303/
Chuck Purvis, MTC
*********************************************************************************************************************
May 19, 2003
AMERICAN COMMUNITY SURVEY ALERT Number 14
Informing you about news, events, data releases, congressional actions, and
other developments associated with the American Community Survey (ACS).
________________________________________
EVENTS UPDATE
ACS Alerts Number 12 and 13 transmitted the testimony from witnesses at the
May 13 Congressional hearing on the American Community Survey. In addition
to the testimony presented at the hearing, the Department of Veterans
Affairs submitted written testimony. The statement for the record from
Stephen Meskin, Chief Actuary for the Department of Veterans Affairs is
attached.
HURRAH! The Census Bureau is now back to getting CTPP Part 1 tables out the door!
-----Original Message-----
From: Clawson, Dave
Sent: Friday, May 16, 2003 9:38 AM
To: SCOP
Cc: Horsley, John; Oakley, Janet; Basso, Jack
Subject: Good news about the CTPP 2000
Late yesterday, we received word from Nancy Gordon of the Census Bureau that they are reversing their April decision to withhold 10 additional CTPP tables from release because of disclosure concerns. Over the past several weeks, Jack Basso and I at AASHTO along with staff from BTS and FHWA have been discussing with Census Bureau staff our concerns about the April decision and the major negative impact it would have on the 2000 CTPP package for the States and MPOs.
I spoke with Phil Salopek of the Census Bureau today regarding the revised schedule now that they have the green light to start releasing these materials (CTPP Part 1). Phil indicated that the first of the state CDs would go out in early June, with all of the states and MPOs having their respective CDs by the end of July. Phil said that they will do a limited production of CDs initially (two per MPO plus the quantity requested by the State DOT). Once a State and its MPOs have their CDs, they would have about a one month period to use it and let the Census Bureau know of any corrections needed. Once a state CD has been through that review process and any corrections have been made, then a larger quantity of CDs would be prepared for public distribution.
Just when the Census Bureau was ready to issue CTPP Part 1, everything has ground to a halt. On April 18, 2003, the Census Bureau advised the CTPP Working Group that 10 tables in CTPP Part 1 could not be released. These 10 tables were in addition to the 3 tables that were already slated to be eliminated, given earlier stated concerns with the quality of Group Quarters data from the decennial census. The logic that would eliminate these 10 tables would ALSO eliminate two very critical tables in Part 3 (flow from home to work), these are: 3-2. Number of Vehicles in Household (4) by Means of Transportation to Work (8), and 3-7. Household Income (5) by Means of Transportation to Work (5). It is not clear what logic the Census Bureau would apply to Part 2 and whether any of those Tables would also be eliminated.
AASHTO is discussing their concerns with the Census Bureau, and we hope to have a resolution soon. However, we cannot even estimate when the CTPP Part 1 will now be released.
Your truly, with major disappointment, and discourgagement,
Elaine Murakami
Federal Highway Administration Office of Planning
206-220-4460
Has there been a schedule change for release of the CTPP (beyond
county-to-county flows)? We had been expecting the data in April, and
the calendar says tomorrow is May!
There have been anouncements on the listserve for initial release of
PUMS-1 percent and SF-4, but no correspondance on the queue for the
finer-detailed CTPP Part 1. Does anyone know where Minnesota might be on
the distribution list? We'd heard about some issues/delays, but are
unsure about the details.
Thanks very much!
Liz Hartmann
Research Analysis Specialist
MnDot Office of Investment Management
TO: CTPP-News
RE: Summary File #4
Summary File #4 data is now being released, and is available on American FactFinder. (http://factfinder.census.gov/)
SF4 data for five states was released today (4/29/03): Delaware, Hawaii, New Jersey, Vermont and Wisconsin. Data is being released on a flow basis.
The main SF4 news release page is here:
http://www.census.gov/Press-Release/www/2003/SF4.html
Full documentation (775 pages in PDF format) for Summary File #4 is available here:
http://www.census.gov/prod/cen2000/doc/sf4.pdf
The Summary File #4 is based on long form, sample data and is provided down to the census tract level. This product is similar to Summary File #2 (SF #2 is based on short form, 100% data; SF #4 is based on long form, sample data).
Similar to SF #2, the minimum population threshold for SF #4 is 100 persons and 50 unweighted cases. This means that there may be no data reported for very small population groups at very small (tract) or even moderate size (place, county) geographic levels.
All tables are iterated for total population and 335 race/hispanic/ancestry groups: 132 race categories; 78 American Indian / Alaskan Native groups; 39 Hispanic/Latino groups; and 86 ancestries (e.g., Irish, Greek, Russian, etc.)
There are 323 total tables in SF #4: 213 "PCT" tables (Population, Census Tract), and 110 "HCT" tables (Housing, Census Tract).
The commute-related tables in SF #4 are PCT55 through PCT60. The household vehicle tables in SF #4 are HCT32 through HCT34.
The Summary File #4 can be useful to researchers and planners who are interested in the socio-economic characteristics of persons in their region or state by race/hispanic/ancestry.
Some examples of analyses:
1. Group quarters population (institutional, non-institutional) by age group by detailed race/hispanic/ancestry group (PCT9)
2. Linguistic isolation by detailed race/hispanic/ancestry groups (PCT41)
3. Migration Status (Where Lived in 1995) by detailed race/hispanic/ancestry groups (PCT49,PCT50)
4. Means of Transportation to Work by detailed race/hispanic/ancestry groups (PCT51)
5. Average Commute Time by detailed race/hispanic/ancestry groups (PCT58)
6. Disability Status by sex by age by detailed race/hispanic/ancestry groups (PCT69)
7. Detailed Industry of Employment by sex by detailed race/hispanic/ancestry groups (PCT85)
8. Detailed Occupation of Employee by sex by detailed race/hispanic/ancestry group (PCT86)
9. Household Income Characteristics by detailed race/hispanic/ancestry group (PCT88-PCT90)
10. Vehicles per Household by detailed race/hispanic/ancestry group (HCT32, HCT34)
11. Households by Tenure by Household Income by detailed race/hispanic/ancestry group (HCT35)
Good luck to those working with this new data!
Chuck Purvis, MTC
**************************************************************
Charles L. Purvis, AICP
Principal Transportation Planner/Analyst
Metropolitan Transportation Commission
101 Eighth Street
Oakland, CA 94607-4700
(510) 464-7731 (office)
(510) 464-7848 (fax)
www: http://www.mtc.ca.gov/
Census WWW: http://www.bayareacensus.ca.gov/
**************************************************************
TO: CTPP-News
The Census Bureau's release schedule for the 1-percent Public Use Microdata Sample (PUMS) has been updated: http://www.census.gov/Press-Release/www/2003/PUMS.html
Data for five states was released last Wednesday: New York, Florida, Rhode Island, Vermont and Wyoming.
Data for New Jersey is tentatively scheduled for release tomorrow, April 30th.
Data for an additional 10 states plus the District of Columbia is tentatively scheduled for release Wednesday, May 7th: Alabama, California, D.C., Illinois, Kansas, Maryland, Nebraska, Oklahoma, Ohio, Puerto Rico and Texas.
We do not know when the remaining states will be released, so it's advised to keep close tabs on the main PUMS page, provided above.
PUMS Technical Documentation is here:
http://www.census.gov/prod/cen2000/doc/pums.pdf
For more on the use of PUMS in transportation planning, visit our TRB Subcommittee's web page at:
http://www.census.gov/prod/cen2000/doc/pums.pdf
Chuck Purvis, MTC
**************************************************************
Charles L. Purvis, AICP
Principal Transportation Planner/Analyst
Metropolitan Transportation Commission
101 Eighth Street
Oakland, CA 94607-4700
(510) 464-7731 (office)
(510) 464-7848 (fax)
www: http://www.mtc.ca.gov/
Census WWW: http://www.bayareacensus.ca.gov/
**************************************************************
