
289Spatial Point Patterns
This process can be done with the seeg addon to Rcmdr. With the unif100xy active, go to
Spatial|quadrat, and then select Quad ChiSq. This would yield the same results as given earlier
using the R console.
8.12.6 GriD or quaDrat analysis: ranDoMness, poisson MoDel
We will use seeg’s function quad.poisson.ppp, which requires a dataset with coordinates
and a target density. This function will define the number of cells in the grid based on the tar-
get intensity or density. Let us use the sample data pois100xy given earlier in section 8.12.3.
Recall that the Poisson model is for rare events. Let us assume a density of about ...