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Opportunity Mapping UpdateSusan Lindell Radke
OUSD GIS Analyst/Contract DemographerJanuary 28, 2011
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TASK FORCE GOALTo develop an expanded data framework, including non-
traditional indicators and aligned data tools to support a full-service community school district and the needs of the whole
child.
Opportunity Mapping Update
Develop a map-based data tool to explore alignment of district-wide socio-economic indicators with school and student based data
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• Current scope of work:Create map-based tool integrating
various school & community databases into a geographic context within an ArcGIS software environment
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• Current scope of work:Task #1: Create district-wide base maps
US Census Bureau American Community Survey 5 Year Block Group estimates
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The American Community Survey (ACS) is an ongoing statistical survey by the U.S. Census Bureau, sent to approximately 250,000 addresses monthly (or 3 million per year)
It regularly gathers information previously contained only in the long form of the decennial census.
It is the largest survey other than the decennial census that the Census Bureau administers.American Community Survey. (2011, January 4). In Wikipedia, The Free Encyclopedia. Retrieved 16:28, January 28, 2011, from http://en.wikipedia.org/w/index.php?title=American_Community_Survey&oldid=405965594
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ACS First Release Top Demographic Indicator Maps
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•2005-2009 Map•2000 Map•2005-2009 vs 2000 Data:
•Estimate & Margin of Error
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2005-2009 Estimate Range: 29.8 to 30.4 (30.1-0.3) to (30.1+0.3)2000 Estimate Range: 27.0 to 27.4 (27.2-0.2) to (27.2+0.2)Difference: 2.9 (30.1-27.2)
Margin of Error (MOE). An MOE is the difference between an estimate and its upper or lower confidence bounds. Confidence bounds can be created by adding the MOE to the estimate (for the upper bound) and subtracting the MOE from the estimate (for the lower bound). All published ACS MOEs are based on a 90 percent confidence level.
Standard Error. The standard error is a measure of the deviation of a sample estimate from the average of all possible samples.
Statistical Significance. The determination of whether the difference between two estimates isnot likely to be from random chance (sampling error) alone.
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But, what about the Margin of Error?
How significant is it?
How does US Census Bureau deal with it?
What is research community saying about it?
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Elephant in the room!!
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ACS Margin Of Error (MOE)
aka…an obvious truth that is being ignored or goes unaddressed
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Functionality and Usability of Information from the American Community SurveyCommittee on National Statistics, October 6, 2006
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Every block…really?
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Given the known error and limitations…
We still thought it was necessary to explore what the ACS showed us about Oakland:
Foreign bornEducational attainmentBelow povertyMedian Household IncomePublic Assistance
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% Foreign Born
MOE
US Census Bureau, American Community Survey 5 Year Estimates 2005-2009
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Highest Educational Attainment: % High School Diploma
MOE
US Census Bureau, American Community Survey 5 Year Estimates 2005-2009
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% Below Poverty*
*Family of 1 earning below $10,830. (FY 2009/2010 Federal Poverty Guidelines)
MOE
US Census Bureau, American Community Survey 5 Year Estimates 2005-2009
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Median Household Income
US Census Bureau, American Community Survey 5 Year Estimates 2005-2009
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% Public Assistance
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US Census Bureau, American Community Survey 5 Year Estimates 2005-2009
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• Other sources of OUSD data:Free & Reduced Price Meal PlanCalifornia Healthy KidsPhysical Fitness TestOakland Housing Authority
2020
% Free and reduced price meal plan students at each school
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Free and Reduced Price Meal Plan
School-level data mapped to individual student address
School-level data mapped to individual student address / interpolated district-wide
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• Where do we go from here?Search for other sources of socio-
economic data to complement ACS dataMap student data at school level:
California Healthy KidsPhysical Fitness TestOakland Housing Authority
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