PrintMean Nearest Neighbor Distance Analysis for the Crime Patterns
Although nearest neighbor distance analysis on a point pattern is less commonly used now, the outputs generated can still be useful for assessing the distance between events.
The spatstat nearest neighbor function nndist.ppp() returns a list of all the nearest neighbor distances in the pattern.
For a quick statistical assessment, you can also compare the mean value to that expected for an IRP/CSR pattern of the same intensity.
Give this a try for one or more of the crime patterns. Are they clustered? Or evenly-spaced?
1 2 3 4 5 6 7 8 | #Nearest Neighbour Analysisnnd <-nndist.ppp(xhomicide)hist(nnd)summary(nnd)mnnd <-mean(nnd)exp_nnd <-(0.5/ sqrt(xhomicide$n / area.owin(Sbnd)))mnnd / exp_nnd |
Repeat this for the other crimes that you selected to analyze.