ctpp-news March 2004

ctpp-news@mailman.chrispy.net

11 participants
11 discussions

Release of Final CTPP 2000 Part 1 data in ASCII Flat File format

by William Bannister

The final CTPP 2000 Part 1 files are now available for download via the BTS Transtats Website. These files are in Flat ASCII File format. The file layout and SAS code are also available. These files are not in the .IVT format used in the CTPP Access Tool. The website is: www.bts.gov, Click on Data, then on CTPP 2000. We are also providing the preliminary Part 2 file in Flat ASCII format on the same portal. The CD-ROM version along with the CTPP Access Tool is being prepared by the Census Bureau. Once the CD-ROMs are ready, you can order a copy via the BTS website (www.bts.gov, Click on products, then on CTPP 2000). For questions on the Flat ASCII files, please contact Nanda Srinivasan (Nanda.srinivasan(a)fhwa.dot.gov) or Clara Reschovsky (Clara.a.reschovsky(a)census.gov) Bill Bannister Assistant Director Office of Advanced Studies Bureau of Transportation Statistics (202) 366-9934

20 years, 10 months

RE: [CTPP] CTPP Part 2 Comments due March 31

by Srinivasan, Nanda

One correction: My e-mail address is Nanda.Srinivasan(a)fhwa.dot.gov Thank you Nanda Srinivasan 202-366-5021 -----Original Message----- From: clara.a.reschovsky(a)census.gov [mailto:clara.a.reschovsky@census.gov] Sent: Tuesday, March 23, 2004 3:31 PM To: ctpp-news(a)chrispy.net Subject: [CTPP] CTPP Part 2 Comments due March 31 MPO and State DOT users: By now you should have had a chance to review the data from the Part 2 CDs. Any comments you have should be communicated to Nanda Srinivasan at either 202-366-5021 or Nandu.Srinivasan(a)fhwa.dot.gov by next Wednesday, March 31. Thanks for your time in looking at the data. We are about to start sending out Part 1 Final data and will make the Part 3 ASCII data available soon as well. If you have any questions about the timing of the other parts, contact Phil Salopek or me at 301-763-2454 or Phillip.A.Salopek(a)census.gov or Clara.A.Reschovsky(a)census.gov. Clara Reschovsky _______________________________________________ ctpp-news mailing list ctpp-news(a)chrispy.net http://www.chrispy.net/mailman/listinfo/ctpp-news

20 years, 10 months

CTPP Part 2 Comments due March 31

by clara.a.reschovsky＠census.gov

MPO and State DOT users: By now you should have had a chance to review the data from the Part 2 CDs. Any comments you have should be communicated to Nanda Srinivasan at either 202-366-5021 or Nandu.Srinivasan(a)fhwa.dot.gov by next Wednesday, March 31. Thanks for your time in looking at the data. We are about to start sending out Part 1 Final data and will make the Part 3 ASCII data available soon as well. If you have any questions about the timing of the other parts, contact Phil Salopek or me at 301-763-2454 or Phillip.A.Salopek(a)census.gov or Clara.A.Reschovsky(a)census.gov. Clara Reschovsky

20 years, 10 months

Census Brief: Journey-to-Work

by Chuck Purvis

TO: CTPP-News Last week the Census Bureau released a 13-page "Census Brief" on "Journey to Work: 2000". The report, authored by Clara Reschovsky of the Census Bureau, is #C2KBR-33, the 33rd in a series of short, general interest census reports. It is available at: http://www.census.gov/prod/2004pubs/c2kbr-33.pdf or, for the site listing all of the census briefs and special reports: http://www.census.gov/population/www/cen2000/briefs.html There's an interesting table (Table 6) ranking the top 10 metro areas by different means of transportation shares. This is a good report to provide to your executive director and management, to provide the "big picture" on commuting in America. Just be sure to use a color printer due to the full-color U.S. maps included in these briefs. Very helpful report. Chuck Purvis, MTC ************************************************************************************************************************************* IMMEDIATE RELEASE MONDAY, MARCH 15, 2004 Mike Bergman CB04-42 Public Information Office (301) 763-3030/457-3670 (fax) (301) 457-1037 (TDD) e-mail: <pio(a)census.gov> More on 'The Daily Grind' Commute to Work: It's Early, Lonely and Long, Census Bureau Confirms The typical U.S. commuter in 2000 left home between 6:30 a.m. and 8:29 a.m. and drove alone for 26 minutes to get to work, the U.S. Census Bureau said today in a report based on Census 2000 results. Overall, people were leaving home earlier and spending more time in traffic in 2000 than in previous censuses. According to the report, Journey to Work: 2000, about 53 percent of all workers headed to their jobs between 6:30 a.m. and 8:29 a.m. Another 20 percent of workers departed for work between midnight and 6:29 a.m, up 2 percentage points or 4.8 million workers from a decade earlier, the largest hike in any time period of the day. The report is based on responses to questions asked on the census long form, which did not include the distance workers traveled in their journey to work. A sample of households, about 1-in-6 nationally, received the long form. The data are subject to sampling and nonsampling error. -X- Editor's Note: The report can be accessed at <http://www.census.gov/pop/www/cen2000/briefs.html>.

20 years, 10 months

NHTS call for abstracts

by ed christopher

Attached is a call for abstracts for a conference on the National Household Travel Survey sponsored by the Transportation Research Board this coming November. The NHTS complements the CTPP. for more information on the conference please visit http://trb.org/calendar/event.asp?id=125 -- Ed Christopher 708-283-3534 (V) 708-574-8131 (cell) 708-283-3501 (F)

20 years, 10 months

Interesting results from ACS.wpd

by Margaret Shaw

Interesting results from ACS.wpd

20 years, 10 months

Big thanks!

by Bob Schwartz

On behalf of everyone on the listserv, we owe Chuck Purvis a big thanks for his guidance and assistance on everything Census- and transportation-related.

20 years, 10 months

Comparing Employment Data from Decennial Census and CPS

by Chuck Purvis

TO: CTPP-News The State Data Center network has posted some very useful information, provided by Census Bureau staff, in the comparison of employed resident data from the decennial census and the CPS (Current Population Survey). These notes were provided to the SDC network as part of a recent SDC committee meeting, and they are available at: http://www.sdcbidc.iupui.edu/html/news_.html go to the link: "Notes from Tom Palumbo of HHES" to download a WORD document. One site mentioned in Mr. Palumbo's notes is worth mentioning: the Census Bureau page, here: http://www.census.gov/hhes/www/laborfor.html on "labor force statistics." What may be very useful (to some) is the 92-page report: "Comparing Employment, Income, and Poverty: Census 2000 and Current Population Survey" Hope this is helpful. 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/ **************************************************************

20 years, 10 months

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by administration＠chrispy.net

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20 years, 10 months

RE: [CTPP] Interesting Results from the ACS

by Murakami, Elaine

Long post from Elaine Murakami, Federal Highway Administration ACS 2000-2002 Change profiles WARNING: It is not appropriate to compare decennial Census 2000 numbers directly with the ACS 2002 results. We agree (with Phil Salopek) that it is not wise to compare the "current" ACS results directly with decennial 2000, since it appears that methodological differences are making a significant difference in variables like travel time. It is BETTER to compare ACS 2000 figures with ACS 2002 to determine if there has been significant change. The Census Bureau issued a press release on Feb 25, 2004 related to data from the American Community Survey. Right now, the ACS is not in "full implementation" (expected to begin in July 2004). However, an annual sample (1203 counties of 3141 counties in the U.S. are included) is surveyed over 12 months and the results are available for large geographic units (states and some counties). http://www.census.gov/acs/www/Products/Tables/Tables1.htm Under full implementation, all counties will be surveyed. To access the 2000-2002 Change Profiles available for States and large Metropolitan Areas, go to http://www.census.gov/acs/www/Products/Profiles/Chg/2002/0002/index.htm Once you have selected a geography, select the 3rd page of the profile to find tables on means of transportation to work and average commute time. We have extracted State level geography for average travel time, number of workers and percent of workers using transit for their usual commute and it is attached as a spreadsheet. Recently, on the CTPP and the State Data Center listservs there have been discussions about the differences between the two surveys, particularly when people use decennial 2000 data, and then ACS 2002 data, without understanding that the ACS 2000 number may differ significantly. For example: % Carpool to work, US Total 2000 decennial 12.2% 2000 ACS 11.2% 2002 ACS 10.4% It would be misleading to say that carpooling declines by 1.8% between 2000 and 2002. It is probably better to say that carpooling declined by .5% (after assumptions about errors are incorporated). Similar differences occur when comparing average commute times. Average Travel Time to Work, US Total 2000 decennial 25.5 minutes 2000 ACS 24.4 minutes 2002 ACS 24.4 minutes It would be misleading to say that average travel times have declined by 1 minute, when it is more accurate to say that the average travel time remained the same. So far, we believe that the key factors that contribute to the difference between decennial and ACS results include: a. Seasonality (12 months instead of "April 1") (different jobs and workers, especially in summer) b. ACS does not currently include group quarters population. c. ACS has only one-third of counties of the country represented. d. Differences in Non-response follow-up e. Data collection period (ACS is very long, compared to very short in decennial) FHWA research conducted by Westat, using 1999-2001 ACS data, showed that average travel times were significantly different between the ACS and the decennial. Generally speaking, average travel times in Census 2000 are from .8 min to 1.8 minutes LONGER than the ACS reported times. Pima County ACS 25.2 Decennial 26.7 * San Francisco 33.3 34.6 * Broward, FL 28.7 30.5 * Lake, IL 34.6 34.0 * Flathead, MT 20.6 21.4 Bronx, NY 48.0 49.2 * * = significantly diff When examined spatially (by tract) and by mode, there was no pattern found in our limited research to explain the difference. We did not compare by month or season, but some of us suspect some seasonality differences. Another factor may be that the decennial is more likely to capture longer distance commutes. We have not yet been able to compare this, but I hope the NCHRP project on the ACS for transportation planning will explore this issue. Other researchers believe that the use of better-trained, experienced field interviewers is resulting in overall higher quality data in the ACS. Reporting at small geographic units Because the ACS surveys a small sample continuously, for reporting at small geographic units (smaller than 250,000 population), samples over multiple years will averaged. (Note from Elaine—we really don’t know what this means, but are working with the CB to get a better handle on it). For counties or places (e.g. incorporated cities) with population between 65,000 and 250,000, a three-year average can be reported. For areas with less than 65,000, it will require a five-year average before reporting. Last words (at least for today) There are many questions about ACS yet to be answered. The Census Bureau plans to release a series of reports comparing the 1999-2001 ACS test to the decennial census 2000 this Spring. Fiscal year 2005 will be first year when the Census Bureau requests a budget to cover a full 12-months of data collection costs for the ACS. The ACS will require 5 years of data collection before small area reporting can occur. The Census Bureau has promised the transportation community that "small area reporting" includes Block Group and TAZ reporting. However, any cuts to sample size would seriously impact this ability for small area tabultion.

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ctpp-news March 2004