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Exploratory Spatial Analysis using GeoDa
1. Getting to Know Your Data:
Exploratory Spatial Data Analysis
with GeoDa
MEASURE GIS Working Group Meeting
26 June 2012
James Stewart
MEASURE Evaluation
2. Overview
What is Exploratory Spatial Data Analysis
(ESDA)?
What is GeoDa?
GeoDa in action
3. Exploratory Spatial Data Analysis
Visualization and
exploration that
take geographic
location into
account
Identification of
interesting patterns
(e.g., clusters and
outliers)
4. Exploratory Spatial Data Analysis
Data-driven,
bottoms-up
approach to
generating
hypotheses
Provides foundation
for spatial modeling
to explain patterns
(includes OLS)
5. GeoDa
Short for Geographic Data Analysis
Developed by Dr. Luc Anselin, now at Arizona
State University
As of Oct 2011, downloaded over 62,000 times
(since release in Feb 2003)
6. GeoDa
Latest version is OpenGeoDa
Free and open source
Cross-platform
Windows (XP, Vista, and 7)
MacOS
Linux
Run-time executable requires no installation; can
run from anywhere
7. GeoDa in Action
GeoDa toolbar
Beginning map
window
Data must be in
shapefile format
8. GeoDa in Action: Univariate
Choropleth map: quantile, percentile, box map,
standard deviation
Histogram
Cluster analysis
9. Box Map and Box Plot
Rwanda by District, 2010
Percent HIV Positive among Box
Women Age 15-49 Map
Outliers Box
1.5 x IQR Plot
Q3
mean
median
Q1
Source: Rwanda DHS 2010
1.5 x IQR
15. Side-by-Side Comparison
Rwanda by District, 2010
Rwanda by District, 2010 Women Age 15-49 using
HIV Prevalence among Any Modern Method of
Women Age 15-49 Contraception
Source: DHS 2010 Source: DHS 2010
16. Scatter Plot
Rwanda by District, 2010
HIV Prevalence vs. Median Yrs Education
Among Women Age 15-49
Source: DHS 2010
19. Summary
ESDA can help visualize data and formulate
hypotheses
GeoDa is an easy-to-use but powerful tool for
ESDA
GeoDa is free and open source
20. For more information
Visit http://geodacenter.asu.edu/
Tutorials
Videos
Documentation
Detailed glossary
Publications
Working papers
21. MEASURE Evaluation is a MEASURE project funded by the
U.S. Agency for International Development and implemented by
the Carolina Population Center at the University of North Carolina
at Chapel Hill in partnership with Futures Group International,
ICF Macro, John Snow, Inc., Management Sciences for Health,
and Tulane University. Views expressed in this presentation do not
necessarily reflect the views of USAID or the U.S. Government.
MEASURE Evaluation is the USAID Global Health Bureau's
primary vehicle for supporting improvements in monitoring and
evaluation in population, health and nutrition worldwide.