Hot Spot Analysis: the Fundamentals (Gi & Gi*)
Hot Spot Analysis utilizes the Getis-Ord Gi or Gi* statistics. These are local indicators of spatial association. In this video we break down what a LISA is and how the Gi / Gi* statistics are derived from the Global G. In this video we illustrate how we can calculate the Gi using the R programming language with the packages sfdep and dplyr. Local Indicators of Spatial Association - LISA: https://onlinelibrary.wiley.com/doi/1... Blog on Conditional Permution: https://josiahparry.com/posts/csr.html sfdep: https://sfdep.josiahparry.com/ 0:00 - intro 0:15 - local indicators 1:15 - Getis-Ord G 1:45 Local G (Gi) 2:50 - Example 3:20 - Gi numerator 3:34 Gi denominator 5:35 - Gi vs Gi* 7:00 - Gi interpretation 7:35 - Simulated p-values 8:04 - Hypotheses 8:47 - Live coding
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