Description Usage Arguments Value Author(s) References See Also Examples

This method function calculates the semi-variogram for an arbitrary
vector `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.

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`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 |

`...` |
some methods for this generic require additional arguments. None are used in this method. |

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`

.

José Pinheiro and Douglas Bates [email protected]

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

`Variogram`

,
`Variogram.gls`

,
`Variogram.lme`

,
`plot.Variogram`

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