G nearest neighbour distribution function
Calculates an estimate of the G nearest neighbour distribution function.
Ghat(pts,s)
pts |
A points data set |
s |
A vector of distances at which to evaluate the G function |
The function Ghat(pts,s) is defined as the proportion of members of a
point set for which the distance to the nearest other member of the set
is less than or equal to s.
A vector of the same length as s, containing the estimate of G at the
distances in s.
Rowlingson, B. and Diggle, P. 1993 Splancs: spatial point pattern analysis code in S-Plus. Computers and Geosciences, 19, 627-655; the original sources can be accessed at: https://www.maths.lancs.ac.uk/~rowlings/Splancs/. See also Bivand, R. and Gebhardt, A. 2000 Implementing functions for spatial statistical analysis using the R language. Journal of Geographical Systems, 2, 307-317.
data(uganda) plot(seq(20, 500, 20), Ghat(as.points(uganda), seq(20, 500, 20)), type="l", xlab="distance", ylab="Estimated G")
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