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This method function calculates the semi-variogram values
corresponding to the Rational Quadratic correlation model, using the
estimated coefficients corresponding to object
, at the
distances defined by distance
.
# S3 method for corRatio
Variogram(object, distance, sig2, length.out, ...)
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
.
an object inheriting from class "corRatio"
,
representing an Rational Quadratic spatial correlation structure.
an optional numeric vector with the distances at
which the semi-variogram is to be calculated. Defaults to
NULL
, in which case a sequence of length length.out
between the minimum and maximum values of
getCovariate(object)
is used.
an optional numeric value representing the process
variance. Defaults to 1
.
an optional integer specifying the length of the
sequence of distances to be used for calculating the semi-variogram,
when distance = NULL
. Defaults to 50
.
some methods for this generic require additional arguments. None are used in this method.
José Pinheiro and Douglas Bates bates@stat.wisc.edu
Cressie, N.A.C. (1993), "Statistics for Spatial Data", J. Wiley & Sons.
corRatio
,
plot.Variogram
Variogram
cs1 <- corRatio(7, form = ~ Time | Rat)
cs1 <- Initialize(cs1, BodyWeight)
Variogram(cs1)[1:10,]
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