CTPP December 2006

ctpp@listserv.transportation.org

2 participants
3 discussions

[CTPP] 2005 ACS Data Release

by Zakaria

Hello Everyone: On September 8, 2006, I posted on this network, some comments on the 2005 ACS data on population and journey-to-work estimates for the Delaware Valley region which consists of five counties in Pennsylvania and four in New Jersey. In this email, I want to discuss the Delaware Valley Regional Planning Commission's (DVRPC) experience with the 2005 ACS employed persons by place of work at the county level. DVRPC uses census employed persons by place of work to develop the number of jobs or employment. Employment data are used in the DVRPC modeling process to estimate trip attractions by trip purpose. To account for total employment, DVRPC factors upward census employed persons by place of work to account for workers who have multiple jobs and workers who were on vacation or sick during the survey days. DVRPC has used this method successfully to develop employment estimates based on the long-form of Census 2000. The application of this method to 2005 ACS data on employed persons produces erroneous results compared to those obtained from Census 2000. The 2005 ACS employed persons by place of work results in reasonable employment estimates for only three counties of the DVRPC nine counties. Employment estimates for three of the remaining six counties are significantly underestimated and three are overestimated. For example, the employment estimate for Delaware County, PA is underestimated by 24,500 jobs or 10.3 percent compared to estimates from secondary sources. Conversely, the employment of Burlington County, NJ is overestimated by 16,300 jobs or 8.1 percent. These errors are expected in the 2005 ACS results because of many reasons, including the ACS sample size is too small, the population universe in estimated rather than counted, and the data collection procedures are not comprehensive. To produce reasonable employment data, DVRPC has used employment estimates from other secondary sources such as BEA, BLS and ES 202. Unfortunately, none of these sources can be used without adjustment. BEA data have always been overestimated and BLS and ES 202 have always been underestimated. Also, the margin of error in local employment estimates is generally large. Hopefully, the planned accumulation of ACS data for five years (2007-2011) may produce more accurate employment estimates than the 2005 ACS data and data from secondary sources. Thabet Zakaria Deputy Director, Technical Services Delaware Valley Regional Planning Commission Philadelphia, PA 19106 Phone: 215-238-2885 Email: tzakaria(a)dvrpc.org Fax: 215-592-9125

18 years, 8 months

[CTPP] ACS Significance Testing: A Statistical Tool in MS Excel

by Nanda.Srinivasan＠dot.gov

All- New York State Data Center (SDC) staff (Leonard M. Gaines and Bob Scarmadalia) developed an excellent MS Excel spreadsheet tool to calculate statistical significance of differences and margins of error for calculations using data from the American Community Survey. Please feel free to use the worksheets in the attached MS Excel Spreadsheet (StatisticalCalculationsMenu_V21.xls). http://www.census.gov/acs/www/Products/users_guide/ACS_2005_Statistical_Tes… Any feedback would be appreciated by NY SDC (LGAINES(a)EMPIRE.STATE.NY.US). Thank you Nanda Srinivasan

18 years, 8 months

[CTPP] Online ACS Seminar

by Nanda.Srinivasan＠dot.gov

Continuing with the series of seminars on ACS, we have scheduled a 1-hour web-based session on tables from the American Community Survey. Similar to the last seminar held in September, topics include: 1. A Short Update on the current status of the CTPP. 2. Accessing 2005 ACS data using the American Factfinder portal. Date: Monday, December 18, 2006 Time: 2:00- 3:00 p.m. EASTERN Connections: 50 (If we get more requests, we will try to get additional connections) Register at https://www.nhi.fhwa.dot.gov/resources/webconference/web_conf_learner_re g.aspx?webConfID=10917 For more information, please contact Nanda Srinivasan at ctpp(a)dot.gov "ACS Training" Web Conference Presented by Ed Christopher & Ken Bryson Questions? Contact <mailto:NANDA.SRINIVASAN(a)DOT.GOV> Nanda Srinivasan, 202-366-5021 or <mailto:ctpp(a)dot.gov> ctpp(a)dot.gov The American Community Survey (ACS) was fully implemented in 2005. Currently, data from the full implementation is available on the Census Bureau's website for all areas in the U.S. with population of 65,000 or higher. This training will help users understand ACS, and use the American Fact Finder website to download and examine ACS data for their areas. Monday, December 18th 2006 2:00 p.m. (Eastern Time) <https://www.nhi.fhwa.dot.gov/resources/webconference/web_conf_learner_r eg.aspx?webConfID=10917> REGISTER NOW Click the above link to Register as a GUEST Additional Resources 1. Get instruction on how to join a Web conference as a Guest: Click <http://fhwa.breezecentral.com/wctparticipate> Here 2. Check your system NOW for the Flash player: Click <http://admin.breezecentral.com/common/help/en/support/meeting_test.htm> here 3. View a short tutorial on Web Conference Participation Tips: Click <http://fhwa.breezecentral.com/wcttips> Here 4. View an overview of Web conferencing at FHWA: Click <http://fhwa.breezecentral.com/wc101> Here We are committed to providing equal access to this online event for all participants. If you need alternative formats or other reasonable accommodations, please contact <mailto:Webconferencing(a)fhwa.dot.gov> Webconferencing(a)fhwa.dot.gov as soon as possible. If you cannot attend the Web conference and would like to cancel, please contact <mailto:webconferencing(a)fhwa.dot.gov?subject=Registration%20Cancellation > Webconferencing(a)fhwa.dot.gov with your cancellation as soon as possible.

18 years, 8 months

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CTPP December 2006