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Using the American Community Surveyfor Children’s Research

Dr. Richard RathgePolicy Analyst

North Dakota Kids Count

Kids Count Annual Meeting

Baltimore, Md

Sept. 24, 2010

Presentation Objectives:

1. Highlight some key challenges of using ACS for children’s research

2. Illustrate the need for a conceptual shift in the way we approach children’s research when using ACS data

3. Initiate dialogue of implications for research and policy

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Key Challenges for children’s research

Effects of longer period estimates Consequences of smaller sample

size Rule changes and their impact on

trend analyses

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Period Estimates … ACS vs. Census

Census (conceptually point in time April 1st)

ACS accumulates 12 months (1-year estimate) 36 months (3-year estimate) 60 months (5-year estimate)

Think of shutter speed on camera

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Nebraska ACS Data

Thanks to Jerry Deichert for data

Omaha city was an ACS test sites: 1997-2004 Can examine 1, 3, 5-year data

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Key Challenges for rural areas

Effects of longer period estimates Consequences of smaller

sample size Rule changes and their impact on

trend analyses

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ACS sample size is smaller than Census

One-year sample is 2.5 % of HHs vs 16.7% for Census long form Over five-year period, ACS sample size

is 12.5 percent

Therefore ACS sampling error will be larger

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Cass County, North Dakota (population 132,585)

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People Moving to North Dakota Within the Past Year by State of Origin: 2006 ACS

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Comparison of 1-year, 3-year, and 5-year Estimates of the Percentage of Persons in Poverty for Omaha, NE: 1999-2005 ACS

1999 2000 2001 2002 2003 2004 2005

Single-year estimate 11.4 12.0 11.0 12.3 13.5 13.9 15.3

Single-year MOE 0.8 1.0 1.0 1.5 1.6 1.5 1.5

Three-year estimate 11.4 11.7 12.1 13.2 14.2

Three-year MOE 0.5 0.7 0.8 0.8 0.8

Five-year estimate 11.9 12.5 13.2

Five-year MOE 0.5 0.5 0.6

Suppression Issues

ACS using suppression similar to the 1970 and 1980 decennial census

Applied to base tables in 1 and 3-year data

Use “data release rules” to protect user from tables “whose reliability is unacceptable”

Suppresses entire table not just unreliable cells

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41 cells which willcause suppressionfor smaller counties

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Key Challenges for rural areas

Effects of longer period estimates Consequences of smaller sample

size Rule changes and their impact

on trend analyses

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ACS income not compatible with decennial census data

Decennial census asks income in previous calendar year

ACS asks income in previous 12 months Both are inflation adjusted However, Bureau test results show decennial

income consistently lower than ACS (4.4% nationwide)

Bureau suggests users “exercise caution”

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Residency rules very different

Decennial census- “usual place of residence “using 6+ month” rule.

ACS – current residence during the last 2-months. Attempting to better count seasonal

residents

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What lessons have we learned thus far?

Need to be more mindful of our data users

Rethink how we interpret and disseminate data to the public

Examine ways in which we can better educate ourselves and data user

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ACS Presentation 2010

Dr. Richard Rathge, Policy Analyst North Dakota Kids Count, Fargo, ND

NDSU, IACC 424, Fargo, ND 58108 Richard.Rathge@ndsu.edu Phone: (701) 231-8621 Fax: (701) 231-

9730 URL: www.ndkidscount.org

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