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CTPP - - Just the Basics
Census Transportation
Planning Products
program
What is the CTPP?
Background
Organizational
Structure
Products
Special Tabs
Resources
CTPP is an umbrella program of
1. Data Products
2. Custom Data Tabulations
3. Training
4. Technical Assistance
5. Research
for the transportation community
CTPPs main focus is on data from U.S.
Census Bureau and the American
Community Survey (ACS)
Census Transportation Planning Products
What is the CTPP
ACS grew out of the Long Form
1940 Sampling (Long
Form) First Used
All HH Occupants
Congressionally Mandated
Questions
Questions Change
Overtime
2000 was the LAST
Decennial Long Form
17% Sample of Households (1 in 6)
~ 12 pages
Monthly Mortgage Real Estate Taxes Indoor Plumbing
Income
Occupation
Educational Level
Household age
Number of Rooms
• Continuous Survey Methodology
• 300,000 Households sampled per month
• About 1 in 40 Households sampled per year
• Produces annual and multi-year estimates of the characteristics of the population and housing
• Same transportation questions as long form
ACS Facts
Once Data is collected
Three basic Data Products
1. Annual estimates (places over 65K pop)
2. 3-year estimates (places over 20K pop)
3. 5-year estimates (all places including tracts,
block groups)
Period Estimates
Place of Work
Means of Transportation to Work
Carpool Occupancy to Work
Departure Time for Work
Travel Time to Work
Vehicles Available
B
B
CTPP Keys in on Transportation Data
CTPP Concepts
Summarized data by
Place of Residence
Place of Work
Flows between Home and Work
Custom Geography (Local TAZs)
Unique Universes (e.g. workers in HHs)
Designed and paid for by transportation
planners for transportation planners
l All States + DC
l AASHTO Led
l Oversight Board
l Five Year period
~ 2013
AASHTO CTPP Program
Federal Technical Advisory Group
TRB Subcommittee -- List Serve
Quarterly Newsletter -- Outreach
Several Websites
Acquire Data and
Develop Products 53%
Research, Training
and Outreach 39%
Manage Program 5%
Board Discretion 3%
TOTAL $5,844,332
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States
Laine Heltebridle, PA (Region I)
Greg Slater, MD (Region I)
Hui Wei Shen, FL (Region II)
Juyin Chen, VA (Region II)
Phillip Mescher, IA (Region III)
Cory Pope, UT (Region IV)
Ayalew Adamu, CA (Region IV)
MPOs
Kristen Rohanna, SANDAG
Brian Lasagna, BCAG
Mell Henderson, MARC
Arash Mirzaei, NCTCOG
Guy Rousseau, ARC
Clara Reschovsky, MWCOG
Bill Schaeffer, MATPB
MaryAnn Waldinger, COMPASS Ex Officio Members Ken Cervenka, FTA
Ed Christopher, FHWA
Rich Denbow, AMPO
Alison Fields, Census Bureau
Matt Hardy, AASHTO
Jonette Kreideweis, Consultant
Brian McKenzie, Census Bureau
Elaine Murakami, FHWA
Janet Oakley, AASHTO
Alan Pisarski, Consultant
Steven Polzin, USF. CUTR
Melanie Rapino, Census
Nanda Srinivasan, TRB
Erika Young NARC
Liang Long, Technical Adjunct
Chair: Jennifer Toth, AZ (Region IV)
Vice Chair: Susan Gorski , MI (Region III)
AASHTO Liaison: Penelope Weinberger
17 voting members: 9 states and 8 MPOs
Consensus Decision Making
AASHTO CTPP Oversight Board (ACOB)
CTPP Data Products
Data Profiles
3-year ACS Tables
5-year ACS Tables
Current Products
What are they?
2000 Profiles (1990 and 2000 Long Form data)
2005 Profiles (1990, 2000 and 2005 ACS1)
2007 Profiles (2000 and 2007 ACS3)
2010 Profiles (2000 and 2010 ACS5) coming soon
l Data Summaries
l Focus on Transportation
Variables
l Resident and Workplace data
l Includes Significance Tests
l And MOEs for 2000 Data
l Various Geographies
2000 Profiles
States and all counties
2005 Profiles (2005 ACS1)
States, Large Cities (over 65K), MSAs and
CSAs, PUMAs for some tables
2007 Profiles (2007 ACS3)
States, Counties and Places (over 20K)
2010 Profiles (2010 ACS5)
States, Counties and Places (over 5K)
Workplace Residence
Includes
What Areas do the Profiles include?
Where do I find the Profiles?
http://ctpp.transportation.org
Finding CTPP Profiles
http://download.ctpp.transportation.org/profiles_2005-2007/ctpp_profiles.html
3-year CTPP Data Product (2008 CTPP3)
CTPP 3-Year
January 2011
2006, 2007, 2008
20,000 Pop. Areas
(County, Place, PUMAs)
Actual Flows
http://ctpp.transportation.org/Pages/3yrdas.aspx
(2008 CTPP3) Product Design
2008 Geography
MSA – EACH Principal City
Metropolitan Statistical Area
State-POW PUMA
State-PUMA (red = 2000 geo.)
State-Place
State-County-MCD
State-County
Nation (US Total)
Product Structure
3-Parts
Part 1- Place of Residence
Part 2- Place of Work
Part 3- Flows between
Home and Work
On-Line Data Retrieval
Extraction Software ~ Raw Data Download
State
http://ctpp.transportation.org/Documents/CTPP_custom_tabulations_based_on_3yracs2006_2008.xls
(2008 CTPP3) Product Summary
Highlights Low Lights Based on CTPP2000 Tables
Many NEW Univariate Tables
More Age Tables
Streamlined Race Tables
More HH and HH Lifecycle Tables
More English Proficiency Tables
Way more Flows Tables
Incomplete Coverage
Rounded
Reduced Number of Crosstabs with Mode
-- Travel time -- Household income -- Vehicle availability -- Age -- Time leaving home
Tables will have Suppression
-- Means based on 3 values -- 3 records in Flow
Large MOEs (@ 90%)
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Requires Disclosure Proofing
5-year CTPP Data Product (2010 CTPP5)
• Cell Means and
aggregates require 3
unweighted records
The are disclosure rules
• For Pt 3 Flow Tables:
3 unweighted records
for each table, each cell, with the exception
of the 1-way Means of Trans. table
• 3 unweighted records for the marginal's in
any cross-tabulation with Means of Trans.
Disclosure Rules Eliminated
NCHRP 08-79 ($550K)
Producing Transportation Data Products from
the ACS that Comply With Disclosure Rules
NCHRP is funded by State DOTs SP&R
Project schedule: August 2011
Process applied to 2006-2010 5-year CTPP ACS Product
Westat, Tom Krenzke, PI
http://onlinepubs.trb.org/onlinepubs/nchrp/nchrp_w180.pdf
8-79 Summary using 3-year Table list
Means of transportation Aggregate Vehicles Used
Aggregate Travel Time Mean HH Income
Aggregate HH Income Aggregate Carpools
Almost all Part 3 Tables
Tables Using Perturbed Data Set
● Asymmetrical Flows (in red)
● Small Areas defined by MPOs in MPO areas and States Elsewhere
● Tracts are Defaults for Small Areas
● Default TADs by AASHTO
5-year Geography and Flows
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Table Request Process
CTPP Oversight Board and others Identified
Tables (Summer 2011)
AASHTO sent request to CB (Sept 2011)
CB reviews and responds with a price and
conditions (May 2012)
Contract signed
Production Begins
Tables submitted to AASHTO
Packaging Begins (June 2013)
Users get data (Summer 2013)
Resources
Penelope Weinberger CTPP Program Manager, AASHTO 444 North Capitol Street NE Suite 249
Washington, DC 20001
202-624-3556
http://ctpp.transportation.org
Special Staff and Contacts
Brian McKenzie CTPP Program Manager
Census Bureau
301-763-2454
Liang Long CTPP Technical Support
FHWA
202-366-6971
“Status Report” newsletter
http://www.fhwa.dot.gov/planning/census_issues/ctpp/status_report/
http://www.trbcensus.com/newsletters.html
FHWA website
http://www.fhwa.dot.gov/planning/census_issues/ctpp/
Developing Training Materials
http://ctpp.transportation.org/Pages/trainingresources.aspx
AASHTO CTPP Website
E-Learning
Recorded Webinars
http://ctpp.transportation.org/Pages/webinardirectory.aspx
http://ctpp.transportation.org/Pages/elearningmodules.aspx
CTPP websites
http://www.fhwa.dot.gov/planning/census_issues/ctpp/
http://www.TRBcensus.com
http://ctpp.transportation.org
Exercise 1- - ACS Questionnaire
2011 Questionnaire http://www.census.gov/acs/www/Downloads/questionnaires/2011/Quest11.pdf
2011 Questionnaire Instructions http://www.census.gov/acs/www/Downloads/questionnaires/2011/Guide11.pdf
http://www.census.gov/acs/www/methodology/methodology_main/
Visit the Survey Methodology main page
Summary of
Questionnaire Changes
1996 to 2009
Group Quarters
Other Years
Puerto Rico
Sample Size
and
Data Quality
Getting Ready to work with CTPP Data
Remember -- CTPP Data products
have 3 parts
and many Universes
Exercise 2- - Finding the Right Table
Exercise 2
In this exercise you will begin to understand
Tables, Universes and Parts in CTPP Data
Products. When working with CTPP data knowing
which table to use makes your work so much
easier. For this exercise you will need to use the
list of CTPP tables distributed in class. Please
complete the questionnaire identifying which
Part, Universe and Table you would need
Exercise 2- - Finding the Right Table
Exercise 2- - Finding the Right Table
Exercise 2
Exercise 2
Exercise 3- Logging on to CTPP Data
http://ctpp.transportation.org/Pages/3yrdas.aspx
Exercise 3- You have to register
http://data.ctpp.transportation.org/CTPP/
Exercise 4- Create your own data profile
In this Exercise you will take
everything you learned and
apply it to find some general
characteristics of a single
area. It can be any city or
county you want, but it must
be one that has 3-year ACS
data (i.e. more than 20K
residents). For this exercise
you should limit your data
search to using only 3-year
CTPP data.
Exercise 4- Helper
Miscellaneous Material
https://connectdot.connectsolutions.com/p22twaxszhi/
Webinar on Deep Linking with Handouts
ftp://ftp2.census.gov/geo/tiger/TIGER2010/TAZ/2010/
ftp://ftp2.census.gov/geo/tiger/TIGER2010/TAD/
Tiger Files with TAZs and TADs
For TAZs the file name is name will be
tl_2011_XX_taz10.zip (where XX= State FIPS)