nlme (version 3.1-16)

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

Description

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

Usage

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

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

corSpher, plot.Variogram

Examples

data(BodyWeight)
cs1 <- corSpher(15, form = ~ Time | Rat)
cs1 <- initialize(cs1, BodyWeight)
Variogram(cs1)[1:10,]