default.aniso {georob} | R Documentation |
Setting Default Values of Variogram Parameters
Description
Auxiliary functions to set sensible default values for anisotropy parameters and for controlling what variogram and anisotropy parameters should be estimated.
Usage
default.aniso(f1 = 1., f2 = 1., omega = 90., phi = 90., zeta = 0.)
default.fit.param(
variance = TRUE, snugget = FALSE, nugget = TRUE, scale = TRUE,
alpha = FALSE, beta = FALSE, delta = FALSE, gamma = FALSE,
kappa = FALSE, lambda = FALSE, mu = FALSE, nu = FALSE)
default.fit.aniso(f1 = FALSE, f2 = FALSE, omega = FALSE,
phi = FALSE, zeta = FALSE)
Arguments
variance |
variance (sill |
snugget |
variance (spatial nugget
|
nugget |
variance (nugget |
scale |
range parameter ( |
alpha , beta , delta , gamma , kappa , lambda , mu , nu |
names of
additional variogram parameters such as the smoothness parameter
|
f1 |
positive ratio |
f2 |
positive ratio |
omega |
azimuth in degrees of the first semi-principal axis of the
semi-variance ellipsoid (default |
phi |
90 degrees minus altitude of the first semi-principal axis of
the semi-variance ellipsoid (default |
zeta |
angle in degrees between the second semi-principal axis and
the direction of the line defined by the intersection between the
|
Value
Either a named numeric vector with initial values of anisotropy
parameters (default.aniso
) or named logical vectors, controlling
what parameters should be estimated (default.fit.param
,
default.fit.aniso
).
Author(s)
Andreas Papritz papritz@retired.ethz.ch.
See Also
georobPackage
for a description of the model and a brief summary of the algorithms;
georob
for (robust) fitting of spatial linear models.
Examples
default.aniso(f1 = 0.5, omega = 45)
default.fit.param(scale=FALSE, alpha = TRUE)
default.fit.aniso(f1 = TRUE, omega = TRUE)