Office of Planning, Environment, & Realty (HEP)
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Census 2010 will be only a SHORT FORM Census. This means NO LONG FORM questions. The LONG FORM questions are asked in a continuous survey called the American Community Survey (www.census.gov/acs/www).
For a list of questions in Census 2010, please see an article in the Wall Street Journal Feb 23, 2007. There are 6 basic questions and an additional 3 for "householder" which have not yet been determined.
Please see http://www.fhwa.dot.gov/planning/census_issues/american_community_survey/ This link includes links to training on ACS and a new book by Cynthia Taueber.
Main website: http://www.fhwa.dot.gov/planning/census_issues/ctpp/
For both 1990 and 2000, the following data sets are available:
Place of Residence
Place of Work
In addition, the data sets may be broken down into following geographies (varies for each data set and time period):
Please refer to the Data Products page for accessing CTPP data.
Please refer to the following status reports for some applications of CTPP data:
May 2008 - Using Census Data to Analyze Limited English Proficiency (LEP) Populations for Transit Applications
January 2008 - HAZUS- MH: FEMA's software program for estimating potential losses from Disasters
August 2007 - Using CTPP 2000 Data for the Trans Texas 35 Corridor Model
March 2007 - Use of CTPP to assess transit access to the Manhattan CBD
January 2007 - Peak Spread of Journey-to-Work
September 2006 - Use of CTPP at the Eastgate MPO, Youngstown, Ohio
April 2006 - Calculating/Analyzing Transit Dependent Populations Using 2000 Census Data and GIS
Please click here for more information on the history of the CTPP.
The CTPP 2000 is divided into three parts:
The CTPP 1990 is divided into three parts:
To learn more and access CTPP data products, visit the Data Products page.
1990 - Travel time was limited to 2 digits, with a maximum of 99 minutes allowed
2000 - Travel time expanded to a 3 digit field, with a maximum of 200 minutes allowed
"Data Rounding in CTPP 2000"
Please see http://www.fhwa.dot.gov/planning/census_issues/ctpp/status_report/sr0105.cfm (Article under Ed Christopher).
Also read the following for PART 3.
See Trouble Shooting with the CTPP Software above.
Please see http://www.fhwa.dot.gov/planning/census_issues/ctpp/training/ctppatwork.cfm and http://www.fhwa.dot.gov/planning/census_issues/ctpp/status_report/sr0503.cfm "A discussion on some Census terms"
Generally speaking, about 25 percent of workers do not provide sufficient information about workplace locations, so their workplace is imputed using travel time, travel mode, industry and occupation.
Please refer to the following articles from the January, 2004 and the May, 2003 CTPP Status Reports for more in-depth information on accessing and understanding CTPP data: "CTPP Workers at Work Compared to Other Employment Estimates" and "A discussion on some Census terms" respectively. Also, click here for an article on "CTPP Workers-at-Work Compared to Other Employment Estimates" .
SOME of the Part 3 tables were subject to THRESHOLDS. All of the CTPP is subject to ROUNDING. Part 3 Tables 1 and 2 are NOT subject to thresholds.
However, those subject to the thresholds have a LOT of SUPPRESSION for small geography. http://www.trbcensus.com/notes/small_area_data.pdf
One way to get around rounding and thresholds for Part 3 is to use Table 3-14 and Table 3-8. For instructions, please see http://www.chrispy.net/pipermail/ctpp-news/2005-May/001338.html