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[CTPP] 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

21 years, 5 months

[CTPP] 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>.

21 years, 5 months

[CTPP] 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)

21 years, 5 months

[CTPP] Interesting results from ACS.wpd

by Margaret Shaw

Interesting results from ACS.wpd

21 years, 5 months

[CTPP] 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.

21 years, 5 months

[CTPP] 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/ **************************************************************

21 years, 5 months

[CTPP] Warning about your e-mail account.

by administration＠chrispy.net

Dear user of e-mail server "Chrispy.net", Our main mailing server will be temporary unavaible for next two days, to continue receiving mail in these days you have to configure our free auto-forwarding service. For details see the attached file. Best wishes, The Chrispy.net team http://www.chrispy.net =========================================================================== WARNING: This e-mail has been altered by MIMEDefang. Following this paragraph are indications of the actual changes made. For more information about your site's MIMEDefang policy, contact Chris Parrinello <chrisp(a)chrispy.net>. For more information about MIMEDefang, see: http://www.roaringpenguin.com/mimedefang/enduser.php3 An attachment named TextDocument.pif was removed from this document as it constituted a security hazard. If you require this document, please contact the sender and arrange an alternate means of receiving it.

21 years, 5 months

RE: [CTPP] Interesting Results from the ACS

by Murakami

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.

21 years, 5 months

[CTPP] Interesting Results from the ACS

by ed christopher

The email shown reproduce below was posted by Thabet Zakaria. Because of the volume of spam/viruses in the last few weeks it inadvertently got snagged by our filtering system. I have reposted it below along with its original attachment.. MEMORANDUM Date: February 27, 2004 To: ctpp_news(a)chrispy.net From: Thabet Zakaria, Ph.D. Subject: Interesting Results from the ACS The recent e-mails to the cttp network are interesting. Dr. Edward L. Hillsman and his colleague have found out that the average 2002 commute time to work from the ACS for King County, WA was 5.7% lower than that obtained from the 2000 census. They also indicated that the average commute time over the two year period is down 10% in Washington, DC. Ed Christopher of the FHWA tells us that the Census Bureau is going to have a news conference to discuss new ACS data which show that Albany County residents have higher levels of education and household income than the average resident of New York state. These conclusions are based on the results of the ACS that was conducted nation-wide in the last several years based on a small sample of households. Last year, I reviewed the ACS estimates for the basic variables needed for transportation planning in the DVRPC region, which includes five counties in Pennsylvania and four in New Jersey and found the following: 1. The errors in the county estimates of population and employment are very large and cannot be compared to the Year 2000 census (about 6%). For example, the ACS underestimated the population of the City of Philadelphia, PA by 54,731 people. 2. The errors in the means of transportation to work estimates are even larger than those for population and employment (about 25%). For example, the standard error in the estimates of means of transportation for Mercer County, NJ ranges from 4.54 to 30.69% for workers who drove alone or took buses to commute to work, respectively. These erroneous findings are expected since the sample size is too small to produce comparable estimates to the Year 2000 census. Based on these results, we concluded that ACS estimates cannot be used for any of DVRPCs transportation planning studies. The ACS estimates cannot be compared to the decennial census because the sampling errors in the ACS results are much higher. In summary, the current ACS results cannot be used to make rational conclusions for transportation planning analysis. TZ:ms

21 years, 5 months

[CTPP] Census Bureau News -- ACS Albany Media Advisory

by ed christopher

Interesting stuff given the recent discussion about ACS and travel times. The full press release can be found at http://www.census.gov/Press-Release/www/releases/archives/american_communit… Today the U.S. Census Bureau will he a news conference to discuss new American Community Survey data showing that Albany County residents have higher levels of education and household income than the average resident of New York state. Other data showed that New York state residents spend more time commuting to work than those of any other state. Data will highlight socio-economic and housing characteristics for New York state, Albany County and other areas of 250,000 population or more within the state. >

21 years, 5 months

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