ghat: Estimation of the g function

In dbmss: Distance-Based Measures of Spatial Structures

Estimation of the g function

Description

Estimates the g function

Usage

ghat(X, r = NULL, ReferenceType = "", NeighborType = "", CheckArguments = TRUE)

Arguments

X	A weighted, marked, planar point pattern (wmppp.object).
r	A vector of distances. If NULL, a sensible default value is chosen (512 intervals, from 0 to half the diameter of the window) following spatstat.
ReferenceType	One of the point types. Default is all point types.
NeighborType	One of the point types. Default is all point types.
CheckArguments	Logical; if TRUE, the function arguments are verified. Should be set to FALSE to save time in simulations for example, when the arguments have been checked elsewhere.

Details

The computation of ghat relies on spatstat function sewpcf. The kernel estimation of the number of neighbors follows Stoyan and Stoyan (1994, pages 284–285).

Value

An object of class fv, see fv.object, which can be plotted directly using plot.fv.

References

Stoyan, D. and Stoyan, H. (1994) Fractals, random shapes and point fields: methods of geometrical statistics. John Wiley and Sons.

See Also

gEnvelope

Examples

data(paracou16)
autoplot(paracou16)

# Calculate g
r <- 0:30
(Paracou <- ghat(paracou16, r, "Q. Rosea", "V. Americana"))

# Plot
autoplot(Paracou)

dbmss documentation built on June 8, 2025, 1:59 p.m.