1 Public Transportation Data in the American Community Survey (ACS) and Census Transportation Planning Products (CTPP) Dec 3, 2009 AASHTO Standing Committee on Public Transportation and Multi-State Technical Assistance Program Winter Meeting Melissa Chiu, CTPP Coordinator Journey-to-Work and Migration Statistics Branch Housing and Household Economic Statistics Division U.S. Census Bureau
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1 Public Transportation Data in the American Community Survey (ACS) and Census Transportation Planning Products (CTPP) Dec 3, 2009 AASHTO Standing Committee.
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Public Transportation Data in the American Community Survey
(ACS) and Census Transportation Planning Products (CTPP)
Dec 3, 2009AASHTO Standing Committee on Public Transportation
and Multi-State Technical Assistance Program Winter Meeting
Melissa Chiu, CTPP Coordinator Journey-to-Work and Migration Statistics Branch
Housing and Household Economic Statistics DivisionU.S. Census Bureau
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Transition to the American Community Survey
The 2010 Census will not ask journey-to-work information
Census “long form” information is now asked on the American Community Survey (ACS)Large, continuous demographic surveyProduces characteristics, not a population countProduces annually updated single-year and multi-year
estimates of the characteristics of the population and housing
Produces information for small areas including tracts, block groups and population subgroups - updated every year
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How Does the Sample Compare?Timing
ACS samples every year and spreads sample over 12 months
Census samples once a decade and uses the entire sample at the same time
Follow-upACS subsamples for personal visit follow-upCourt ruled against census subsampling
Sample sizeACS 5-year estimates based on about 11 million
housing units Census sample estimates based on about 18 million
housing units
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ACS Data Release Schedule
Data products are released in the year following the single year or multiyear period in which data are collected.
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Information about the American Community Survey
www.census.gov/acs/Subscribe to the
ACS Alert
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Means of Transportationon the ACS Questionnaire
Same as on Census 2000 long form
Q: How did this person usually get to work last week? Car, truck, or van Motorcycle
Bus or trolley bus Bicycle
Streetcar or trolley car Walked
Subway or elevated Worked at home
Railroad Other method
Ferryboat
Taxicab
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Other Commuting Informationon the ACS Questionnaire
Ridership for car, truck or van Report up to 99 peopleCensus 2000: reporting topcoded at 7 or more
Time left home to go to workHour and minute, time of day
Usual travel time to commute Report up to 999 minutes
Place of work Report street address, zip code Geocoded to block, if possible
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Journey-to-Work ACS Data Products
Data products and prefixes B Base Detailed Table
C Collapsed Detailed Table
S Subject Table
R Ranking Table (single-year only)
GCT Geographic Comparison Table
M Thematic Map
Commuting products are numbered “08” Example: B08xxx is a Base Table on commuting
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Journey-to-Work ACS Data Products
Detailed tables show univariate and crosstab frequencies and some summary statistics
Detailed table examples (B08xxx / C08xxx):Means of transportation by worker characteristicsTravel time by time leaving home Place of work for metropolitan, micropolitan, and non-
metro/micro levelsVehicles available in household
Majority of tables available at both residence geography (B081xx, B082xx, B083xx) & workplace geography (B084xx, B085xx, B086xx)
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Journey-to-Work ACS Data Products
Detail in means of transportation varies by table All 5 public transportation categories shown
on univariate table and sex crosstab3 categories (bus, streetcar and subway,
railroad and ferry) shown on travel time crosstab
A single public transportation category shown on all other crosstabs of means of transportation
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Journey-to-Work ACS Data Products
Subject Tables based on same information as Detailed Tables but more user friendly format
Tables show distribution and summary of characteristics
Examples (S08xx):Commuting characteristics by sex (S0801)
Characteristics by means of transportation to work (Public transportation grouped together)
- at residence geography (S0802)
- at workplace geography (S0804)
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Journey-to-Work ACS Data ProductsRanking Tables, Geographic Comparison Tables,
and Thematic Maps all show data on five measures of commuting: Mean travel time to work (#01) Percent of workers who traveled to work …
by car, truck, or van alone (#02)by carpool (#03) by public transportation (#04)
Percent of workers who worked outside county of residence (#05)
Residence geography only Ranking Tables rank states (R08xx)
(single year data only)
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Journey-to-Work ACS Data Products
Geographic Comparison Tables allow comparison of more geographies on the same measures
Examples (GCT08xx): Mean travel time to work for all countiesPercent of workers who traveled to work by
public transportation for all places (cities)Percent of workers who worked outside
county of residence by urban / rural, metropolitan and micropolitan area status
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Journey-to-Work ACS Data ProductsThematic Maps allow users to design maps on
the same measures (M08xx) Levels of geography available:
StateCounty Metropolitan/ micropolitan statistical areaCongressional district Public Use Microdata Area (PUMA)Combined Statistical Area
Can determine… Data classes: number and breaksBoundaries and features
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The Census Transportation Planning Products (CTPP)
Special tabulation of commuting dataUsed Decennial Censuses since 1960
Plans for using American Community Survey data (2006-2008) and (2006-2010)
Schedule 2006-2008 3-year CTPP planned for release summer
2010
TAZ Delineation program in spring/summer 2011
2006-2010 5-year CTPP currently planned for summer 2012 release