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Published byKarin Marsh Modified over 9 years ago
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Understanding the Four Basic Types of Analysis Paul Trevillion - Esri Michael Sarhan - Esri
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What are the four basic types of analysis? Proximity Overlay Statistical Temporal
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Michael Sarhan Proximity
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What is proximity analysis? Buffer zones around a school
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How do ArcGIS tools measure proximity? Euclidean distance Geodesic Least-cost path
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Categories of Proximity Analysis Area Expanding Numeric value Linear Measure
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Paul Trevillion Proximity Demo
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Paul Trevillion Overlay
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Vector Overlay Which Schools have the most incidents crime nearby?
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Overlay techniques OR Union Identity Intersect
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Apportioning attributes Before split dfbdfbdfb 100 Without ratio policy 100 With ratio policy 70 30 50 30 50 70
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Raster Overlay
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Michael Sarhan Overlay Demo
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Michael Sarhan Statistical Analysis
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Types of Statistical Analysis Descriptive Statistics Inferential Statistics Percent of Total Crimes by Ward in the District of Columbia Hot Spot Analysis weighted on Violent crime in the District of Columbia
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Descriptive Statistics Mean Center Mean center total crime by Quarter CY 2014
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Descriptive Statistics Standard Deviational Ellipses
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Working with data distributions Normal and statistically significant distributions Normal distribution Standard deviation
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Inferential Statistics Average Nearest Neighbor Summary Average Nearest Neighbor Summary The Average Nearest Neighbor tool Dengue fever cases and households
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Inferential Statistics Measures distribution of features and attribute values Spatial Autocorrelation Report Spatial Autocorrelation Report The Spatial Autocorrelation tool
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Inferential Statistics Hot spot analysis
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Paul Trevillion Statistics Demo
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Paul Trevillion Temporal Analysis
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What is temporal analysis? Spatial Variance pH levels measured and analyzed for entire reservoir on same day Spatial Variance pH levels measured and analyzed for entire reservoir on same day Temporal Variance pH levels measured and analyzed at one location each year Temporal Variance pH levels measured and analyzed at one location each year 7.0 6.9 7.1 7.0 6.8 7.0 6.7 6.9 2009 – 6.6 2010 – 6.7 2011 – 6.8
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Incorporating time in your analysis Political violence in Somalia 1997-2011
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Temporal patterns and spatial statistics 196919852002
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Space-time analysis vs. time snapshots
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Michael Sarhan Temporal Demo
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