Variogram(object, distance)
object
| a numeric vector with the values to be used for calculating the semi-variogram, usually a residual vector from a fitted model. |
distance
|
a numeric vector with the pairwise distances
corresponding to the elements of object . The order of the
elements in distance must correspond to the pairs
(1,2), (1,3), ..., (n-1,n) , with n representing the
length of object , and must have length n(n-1)/2 .
|
object
, according to the distances in distance
.
For each pair of elements x,y in object
, the
corresponding semi-variogram is (x-y)^2/2. The semi-variogram is
useful for identifying and modeling spatial correlation structures in
observations with constant expectation and constant variance.variog
and dist
representing,
respectively, the semi-variogram values and the corresponding
distances. The returned value inherits from class Variogram
.Variogram.gls
, Variogram.lme
,
plot.Variogram
library(lme) data(Ovary) fm1 <- lm(follicles ~ sin(2 * pi * Time) + cos(2 * pi * Time), Ovary, subset = Mare == 1) Variogram(resid(fm1), dist(1:29))[1:10,]