1 Population Controls for the American Community Survey Alexa Kennedy-Puthoff Population Division...

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Population Controls for the American Community Survey

Alexa Kennedy-PuthoffPopulation Division

Prepared for the 2009 SDC Annual Training Conference, October 14, 2009

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Overview

Population estimatesPopulation controls provided to ACSPostcensal versus intercensal

estimatesPopulation controls, 2009-2011 ACS

(release years 2010-2012)

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Federal Mandate to Produce Estimates Production and release of population estimates are

required under U.S.C. Title 13, Section 181:

“During the intervals between each census of population…the Secretary, to the extent feasible, should annually produce and publish for each State, county, and local unit of general purpose government which has a population of fifty thousand or more, current data on total population and population characteristics and, to the extent feasible, shall biennially produce and publish for other local units of general purpose government current data on total population.”

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Estimates Produced Annually

Population– Nation by age, sex, race, and Hispanic origin – States by age, sex, race, and Hispanic origin– Counties by age, sex, race, and Hispanic origin– Incorporated places and minor civil divisions (total

population only)– Puerto Rico Commonwealth and municipios by

age and sex

Housing units– States– Counties

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Uses of Population Estimates

Distribution of federal funds Population controls for major surveys

– American Community Survey – Current Population Survey– Survey of Income and Program Participation– American Housing Survey

Denominators for statistical rates Program planning

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Population Controls for ACS

We provide– County by age (single years 0-84,85+),

sex (male, female), race (31 race groups), and Hispanic origin (Hispanic, non-Hispanic)

– Puerto Rico Municipios by age and sex

ACS creates their own set of weights from these controls– Collapses the data provided to the weighting cells

needed

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Postcensal versus Intercensal Estimates Postcensal estimates

– July 1 estimates, full series from last Census date forward (for 2009, series is April 1, 2000-July 1, 2009)

– “Vintage” identified by terminal year in the series • For example, series of estimates released beginning in

December 2009 are the “Vintage 2009” estimates

Intercensal estimates– July 1 estimates, full series between two most recent

Census dates – Begin with Census 2000 and end with Census 2010– Timing issue: We receive Census 2010 data in March

2011; the schedule requires us to produce and provide intercensal-based population controls for ACS by May 2011

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Population Controls by ACS Release Year: 2010

ACS Data Year of Pop Control Release Year

2009 ACS July 1, 2009 controls based on Census 2000 (Vintage 2009)

2010

2007-2009 ACS

Average of July 1, 2007-2009 controls based on Census 2000

2010

2005-2009 ACS


2010

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2010 ACS July 1, 2010 controls based on Census 2010 (simple extrapolation)

2011

2008-2010 ACS


2011

2006-2010 ACS


2011

Notes:

– For 2008-2010, 2008 and 2009 will be based on the intercensal estimates.

– For 2006-2010, 2006 through 2009 will be based on the intercensal estimates.

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2011 ACS July 1, 2011 controls based on Census 2010 (Vintage 2011)

2012

2009-2011 ACS


2012

2007-2011 ACS


2012

Notes:

– For 2009-2011, 2009 will be based on the intercensal estimates and 2010 through 2011 will be based on Census 2010 (Vintage 2011).

– For 2007-2011, 2007 through 2009 will be based on the intercensal estimates and 2010 through 2011 will be based on Census 2010 (Vintage 2011).

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Contact Information

Victoria A. Velkoff(301) 763-7070

[email protected]

Alexa Kennedy-Puthoff(301) 763-6030

[email protected]

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