11d - mapping measures of reliability alongside data from the american community survey
TRANSCRIPT
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Mapping Estimates and their Reliabilityfrom the American Community Survey:
One user’s struggle
Applied Population Laboratory, University of Wisconsin –Madison
David [email protected]
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Charting estimates and reliability:
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Significance Tool appears inactive.
What does Census have to say?
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http://www.esri.com/library/whitepapers/pdfs/the-american-community-survey.pdf
What does ESRI have to say?
Stoplight approach based on Coefficient of Variation
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Is the Coefficient of Variation a good indicator of reliability?
GeographyPoverty Estimate MOE
Standard Error CV Interpretation
Tract A 40% +/- 3% 1.8% 5% Very Reliable
Tract B 4% +/- 3% 1.8% 46% Not Reliable
Coefficient of Variation is the Standard Error as a Percentage of the Estimate
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CV used in a Mapping Context
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Maryland State Data Center Online Mapping
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Quick Fix for ArcGIS Users?David W. Wong, George Mason University ArcGIS that created this Cross Hatch Overlay Latino Poverty Rates by Significance
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Problem #1: Which Measure?• MOE• CV• Compare to Reference Geo• Others…
Problem #2: Bivariate Mapping • Can be hard for viewers to decipher
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Perce
nt Po
verty
Mar
gin of
Erro
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Bars on a map…Latino Poverty Rates by Significance
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Pies on a map…
Larger PiesIndicate HigherPov Rate
Black slicerepresents CV
(SE as prop. of est.)
Latino Poverty Rates by Significance
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Black slicerepresents CV
(SE as prop. of est.)
Latino Poverty Rates by SignificanceCombo…
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CV Significance
Pove
rty
Low High
Low
Hi
ghLatino Poverty Rates by Significance
The Matrix…
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Back to basics…
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Latino Poverty Rates by SignificanceWeb Interactivity…
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Additional Reading