nlme (version 3.1-16)

Variogram.corSpatial: Calculate Semi-variogram for a corSpatial Object

Description

This method function calculates the semi-variogram values corresponding to the model defined in FUN, using the estimated coefficients corresponding to object, at the distances defined by distance.

Usage

## S3 method for class 'corSpatial':
Variogram(object, distance, sig2, length.out, FUN)

Value

a data frame with columns variog and dist representing, respectively, the semi-variogram values and the corresponding distances. The returned value inherits from class Variogram.

References

Cressie, N.A.C. (1993), "Statistics for Spatial Data", J. Wiley & Sons.

See Also

corSpatial, Variogram.default, Variogram.corExp, Variogram.corGaus, Variogram.corLin, Variogram.corRatio, Variogram.corSpher, plot.Variogram

Examples

data(BodyWeight)
cs1 <- corExp(3, form = ~ Time | Rat)
cs1 <- initialize(cs1, BodyWeight)
Variogram.corSpatial(cs1, FUN = function(x, y) (1 - exp(-x/y)))[1:10,]