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