Presentation on theme: "Census Transportation Planning Package Ed J. Christopher FHWA Resource Center near Chicago 19900 Governors Drive Olympia Fields, IL 60461 708-283-3534."— Presentation transcript:
Census Transportation Planning Package Ed J. Christopher FHWA Resource Center near Chicago 19900 Governors Drive Olympia Fields, IL 60461 708-283-3534 firstname.lastname@example.org June 3, 2004
Today Briefly overview the CTPP Punctuate some of the more technical issues to be aware of when working with your data Give you some TIPs for getting started
What is the CTPP? The Census Transportation Planning Package is a set of special tabulations from the long form of the decennial census designed by transportation planners for transportation planners It summarizes the data At Residence At Workplace Flows between Home and Work
What are the CTPP Products? Tabulations at Residence Tabulations at Workplace Flows between Home and Work Part 1Part 2Part 3 Part 1Part 2 Part 3
Who paid for it? Buyers/Users Direct Cost Tables 1960OMB?????? 1970112 $0.6 M 43 1980152 $2.0 M 82 1990 $2.5 M 120 2000 $3.0 M 203 All States and MPOs and MPOs
When is it due out? Residence Based Tables Oct 2002 Mar. 03 April June July-August 2003 June July-August 2003 CTPP is coming out in 3- waves Workplace & Worker Flow Tables Summer 2003 Fall 2003 ------------------- --------------- ------------ ------------------------- ------------ --------------- Winter 2003-2004 and Spring / Summer 2004 ____ ------
Why all the delay? Disclosure Review Board Negotiations (Sept 2001 to Jan 2002)---5 months People Living in Group Quarters Issues (Jan to May 2003)---5 months Inexcusable delays caused by CB on whether or not 13 tables in CTPP Part 1 could be released. Finally, CB agreed to allow all but 3 Tables originally identified Dave Clawson, AASHTO
Why the 2003 Delay? Group Quarters Issue Fear by Census Bureau that one could identify the characteristics of workers who live in group quarters by subtraction SF3--Workers who live in Households and Group Quarters CTPP-- Workers who live in Households Workers who live in Group Quarters - = Modes Used Modes Used Modes Used
The CAT CTPP Access Tool How is it packaged? ASCII Too
What is the Distribution Process? CDs with Extraction Software To MPOs and States First (ASCII also available ) 30 Day review period Corrections made Corrections made Quantities prepared and Redistributed BTS (and others) distribution program(s)
What is the Production Process? Typical Process Preliminary ASCII file produced Preliminary ASCII file produced Preliminary CAT prepared-IVT files Review and Correction Period Final ASCII produced Final CAT produced
Currently, Where are we? Part 1 -- Residence Data BTS has Final ASCII version on TranStats Census is working on Final CAT Files Part 2Work Place Data Preliminary ASCII on TranStats Census working on Corrections Part 3 Flow Data Slightly different process
Part 3 Home Work Flow Tables ACSII files on BTS Server Tract to Tract (May 7) TAZ to TAZ (May 25) CAT Software Distributed Julyish? No Corrections Expected
Mode to Work Circa 1990 For 2000 (ROUNDED) Total352350 (not 355!) Drive Alone212210 Carpool4645 Transit5960 Walk3335 Bike24 Example of Rounding True Total 354
Using the CTPP, 10 + 10 + 10 + 10 = ? Pop Quiz! a) 30c) 35e) 40 b) 45d) 50f) Any of the Above Here's a real life example using the CTPP Part 2 data. Let's say my boss asks as simple question: "How many transit commuters are at work in the Bay Area?" Using the Part 2 data, I am able to provide my boss 15 different answers! Chuck Purvis, MTC
1.Obtain your "regional control totals" from the most geographically aggregate summary levels. 2.Avoid aggregating (summing together) your geographies 3.Avoid aggregating categories. 4.Sum as few categories as possible. 5.Adjust (de-round, un-round) as you see fit. SF3 or PUMS can provide control totals to adjust the CTPP Part 1 data. 6.Develop a sense of humor. Rounding Tips So it is "close enough for government work"
No record threshold Must have 3 unweighted records
http://www.trbcensus.com/articles/ctppworkers.pdf Workers at Work Counts vs. Other Employment Sources Total jobs are HIGHER than CTPP worker counts CTPP uses NAICS, others may use SIC Multi-site businesses and job types not reported consistently Census 2000 employment estimates vs CPS Extended Allocation for CTPP small areas
When I get my CTPP CD-ROM Home What should I do?
With all this said and done now what can I do? Build Regional and sub-area Data Profiles Add Trends to your Profiles Make the Information Available Incorporate data into Planning Process
Stay Connected Are You on the CTPP-News Listserve? Have You Seen our Newsletter (the Status Report)? http://www.dot.gov/ctpphttp://www.TRBcensus.com202-366-5000
When Mining Your Census Data Keep us in Mind Let Us Know What You Have Done We Are Always Interested Want to… Want to… Show Off Your Work? Show Off Your Work? Gain National Exposure? Gain National Exposure? Meet Other Data Users? Meet Other Data Users? Tour Washington DC? Tour Washington DC? Sound Exciting? TRB Urban Data and Information Systems Committee Ed Christopher-Chair (708-283-3534)
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