spatial: expcov – R documentation

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expcov

Spatial Covariance Functions

Spatial covariance functions for use with surf.gls.

expcov(r, d, alpha = 0, se = 1)
gaucov(r, d, alpha = 0, se = 1)
sphercov(r, d, alpha = 0, se = 1, D = 2)

`r`	vector of distances at which to evaluate the covariance
`d`	range parameter
`alpha`	proportion of nugget effect
`se`	standard deviation at distance zero
`D`	dimension of spheres.

vector of covariance values.

Ripley, B. D. (1981) Spatial Statistics. Wiley.

Venables, W. N. and Ripley, B. D. (2002) Modern Applied Statistics with S. Fourth edition. Springer.

data(topo, package="MASS")
topo.kr <- surf.ls(2, topo)
correlogram(topo.kr, 25)
d <- seq(0, 7, 0.1)
lines(d, expcov(d, 0.7))

Functions for Kriging and Point Pattern Analysis

v7.3-14

GPL-2 | GPL-3

Authors

Brian Ripley [aut, cre, cph], Roger Bivand [ctb], William Venables [cph]

Initial release

2021-04-17