But what about the ACS?
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But what about the ACS?. What is the American Community Survey?. Replacement of the Long Form Continuous Survey Methodology Conducted Monthly. According to the Census Bureau The ACS is…. A large, continuous demographic survey

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But what about the ACS?

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But what about the ACS?

What is the American Community Survey?

Replacement of the Long Form

Continuous Survey Methodology

Conducted Monthly


According to the Census Bureau The ACS is…

A large, continuous demographic survey

  • Produces annual and multi-year estimates of the characteristics of the population and housing

  • Produces characteristics, not a population count

  • Produces information for small areas including tracts, block groups and population subgroups - updated every year

  • Key component of reengineered 2010 census


ACS Facts

About 1 in 40 Households Sampled per year

250,000 Households Sampled per month

Same Transportation questions as 2000 Long Form

Decennial Long Form is History, Kaput, Gone!


But why change and have an ACS?

Eliminate the Census Long Form for 2010 and Thereafter

Eliminate the peak in Congressional funding

Eliminate the peak in hiring andtraining Census takers


How does the ACS work?

Three Methods of Data Collection

1. MailSelf-administered mail-out/mail-back

2. TelephoneComputer Assisted Telephone Interviewing (CATI)

3. Personal VisitsComputer Assisted Personal Interviewing (CAPI) 1:3


When will it start?

It already has


American Community Survey Data Release Timetable


Aug. 2010

In August of 2006 you got 2005 data

Aug. 2008


Aug. 2008


Aug. 2010

2010

April 1 August Dec. (PL 94-171)


Main differences between Census Long Form and ACS


Some Emerging Issues

People might be counted twice, e.g. once at summer cabin and once at a “permanent home”. Or once at university and once at parent’s home.

Areas with seasonal populations, e.g. due to “snow bird” migration, and due to school enrollments, with housing occupancy that varies from 95% to 40% might show up as 80%.


Mail back rates from Minority populations are significantly lowerSource: C2SS test


Different Non Response Follow-up rates based on mail back returns

lThat is, in areas with low mail-back returns, a higher NRFU rate will be implemented

lThus, standard errors will be more consistent across neighborhoods


Understanding Sample Error

Sample Error is larger because the number of census forms collected each year are smaller.

Changes of plus or minus 2% may be due to Sample Error and do not reflect measurable change.


Comparing ACS directly to 2000 Data can be iffy

Statistical Significance Tests

Standard Error = Margin of Error / 1.65

But what about MOEs for 2000 data?

90% Confidence


Chapter 8: Accuracy of the Data

Estimate Standard Errors

Adjust for Survey Design Factors - Table C

http://www.census.gov/prod/cen2000/doc/sf3.pdf


Things to consider when trying to compare ACS directly to Decennial data

Seasonality12 months instead of "April 1") (different jobs and workers, especially in summer

Group Quarterscurrently not in 2005 ACS

Non-responsefollow-up differences

Data collection periodACS is very long, compared to very short in decennial

Sample Sizes and MOEsACS is about 1 in 40 households compared to about 1 in 6


Data Release Schedule

1-year data in 2006 (every year thereafter)

3-year data in 2008 (every year thereafter)

5-year data in 2009 (every year thereafter)

Plus the within-year release schedules


Within-Year Data Release Schedule for 2005 Data

August 15, 2006

Demographic and SocialCharacteristics

August 29, 2006

Economic Characteristics; Public Use Microdata File

October 3, 2006

Housing Characteristics; Narrative Profiles; Workplace Base Tables

November 14, 2006

Selected Population Profiles


August 15th Demographic and Social


August 29th Economic Characteristics

and PUMS too


October 3rd Housing ---- Etcetera

i.e. Workplace Tables


October 3rd Etcetera

… For Workplace Geography


November 14 Selected Population Profiles


Where do I get ACS?

FactFinder


There is a lot here

Even built in significance tests


Note difference between DC and NJ


A place to start mining ACS

Go to Detailed Tables


Check out all the Tabs


Pick Your Geography


State . . .


Places . . .


Then Tables . . .


Note the Tabs


Keyword Search


“B” and “C” Tables


Full Table – PASSED FILTERING

Statistically too Small


Collapsed Table


You Can Also Download the Results


Download Options . . .


My Selection


What I took home


Brand New

CTPP Data Product

ACS CTPP Data Profiles

1. Resident Person Information

2. Resident Household Characteristics

3. Worker/Workplace Data


Resident Person Information for…

States, Large Cities, MSAs

Florida Statewide data

Mode to work

Travel Time to work

Departure Time for work

Mode to work by Travel Time

Mode to work by Average Travel Time


Resident Household Characteristics for..

The Nation, States, All PUMAs,

Counties and Places over 65k

Wisconsin Statewide data

Mode to work by Vehicles Available

Vehicles Available in Households

Household Size by Vehicles Available

Vehicles Available by Workers in Household

Persons in Households by Workers in Household


Worker / Workplace Data for…

States, Counties and

Places over 65k

Total Workers -- Travel Time to work -- Mode to Work

Get ACS CTPP Data Profiles online or from the Class Workbook CD


On-going concerns about ACS

  • Will the sample be sufficient for small geographic area reporting? Will tract and BG and TAZ reporting occur after 60 months of data collection?

  • Will Congress continue to fund the survey continuously, especially if CB asks for increasing budgets to meet the sample size requirements? (or will CB decrease the sample size, resulting in loss of small area tabulation?) Group Quarters


What Were the Transportation Concerns in 2005?

  • Will there be flow data? Flows are in serious jeopardy due to thresholds and disclosure proofing?

  • Will there be a CTPP like package? Who will organize it, negotiate with the CB and contract with the CB. Timing of release? Cost?

  • Will there be TAZs? How might they change, what tables will be available, for what geographies?


Consolidated

CTPP Purchase

AASHTO SCOPCensus Data Work Group

CTPP Technical Group


Current Expectations

  • Will there be flow data? Flows are in serious jeopardy due to thresholds and disclosure proofing?

  • Will there be a CTPP like package? Who will organize it, negotiate with the CB and contract with the CB. Timing of release? Cost?

  • Will there be TAZs? How might they change, what tables will be available, for what geographies?


ACS related activities currently underway

NCHRP 8-48 Guidebook Using the American Community Survey Data for Transportation Planning ($350K) Expected May 2007

NCHRP 8-36 Project Disclosure Avoidance Techniques to Improve ACS Data($75) Expected Next Year

Census Geography and Participant Statistical Areas Program — Hoping to have TAZs included

ACS Use Capacity Building Peer Exchange, SCOP Working Group/FHWA, Spring 2007


Census Data for Transportation Planning

Preparing for the Future

Irvine, California

May 11-13, 2005

http://www.trb.org/conferences/censusdata


Now let’s go do some

Statistical Significance Testing!


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