11D - MAPPING MEASURES OF RELIABILITY ALONGSIDE DATA FROM THE AMERICAN COMMUNITY SURVEY
-
Upload
wisconsin-land-information-association -
Category
Technology
-
view
488 -
download
1
Transcript of 11D - MAPPING MEASURES OF RELIABILITY ALONGSIDE DATA FROM THE AMERICAN COMMUNITY SURVEY
Mapping Estimates and their Reliabilityfrom the American Community Survey:
One user’s struggle
Applied Population Laboratory, University of Wisconsin –Madison
David [email protected]
Charting estimates and reliability:
Significance Tool appears inactive.
What does Census have to say?
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
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
CV used in a Mapping Context
Maryland State Data Center Online Mapping
Quick Fix for ArcGIS Users?David W. Wong, George Mason University ArcGIS that created this Cross Hatch Overlay Latino Poverty Rates by Significance
Problem #1: Which Measure?• MOE• CV• Compare to Reference Geo• Others…
Problem #2: Bivariate Mapping • Can be hard for viewers to decipher
Perce
nt Po
verty
Mar
gin of
Erro
r
Bars on a map…Latino Poverty Rates by Significance
Pies on a map…
Larger PiesIndicate HigherPov Rate
Black slicerepresents CV
(SE as prop. of est.)
Latino Poverty Rates by Significance
Black slicerepresents CV
(SE as prop. of est.)
Latino Poverty Rates by SignificanceCombo…
CV Significance
Pove
rty
Low High
Low
Hi
ghLatino Poverty Rates by Significance
The Matrix…
Back to basics…
Latino Poverty Rates by SignificanceWeb Interactivity…
Additional Reading