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Compute Spatial Variogram
Usage
variogram(krig, nint, plotit=T, ...)
Arguments
krig
|
trend-surface or kriging object with columns x , y , and z
|
nint
|
number of bins used
|
plotit
|
logical for plotting
|
...
|
parameters for the plot
|
Description
Divides range of data into nint
bins, and computes the average squared
difference for pairs with separation in each bin. Returns results for
bins with 6 or more pairs.
Value
x
and y
coordinates of the variogram and cnt
, the number of pairs
averaged per bin.
Side Effects
Plots the variogram if plotit = T
See Also
correlogram
Examples
data(topo)
topo.kr <- surf.ls(2, topo)
variogram(topo.kr, 25)