gllvmTMB currently fits isotropic SPDE/GMRF spatial fields. Consequently,
these helpers draw a circle whose radius is the fitted practical range,
sqrt(8) / kappa. Equal axes describe the model assumption (H = I); they
are not evidence that anisotropy was estimated.
Scope: the fitted isotropic-range display is covered by focused tests; the
broader spatial-family evidence remains partial; directional anisotropy,
delta/spatiotemporal fields, and new likelihoods are rejected from this
plotting contract.
Usage
plot_anisotropy(object, return_data = FALSE)
plot_anisotropy2(object, model = 1L)
Arguments
- object
A fitted gllvmTMB_multi model containing an intercept-only or
random-slope spatial field.
- return_data
If TRUE, return the range geometry instead of a plot.
- model
Retained for compatibility. Only model = 1 is supported
because gllvmTMB has one shared spatial range parameter.
Value
plot_anisotropy() returns a ggplot2 object, or a data frame when
return_data = TRUE. plot_anisotropy2() draws the same geometry with
base graphics and invisibly returns a list containing data, range,
kappa, H = diag(2), and anisotropy_estimated = FALSE.
Scope
These functions do not estimate or diagnose directional anisotropy. Delta
and spatiotemporal spatial models are not supported by this plotting
contract and fail explicitly.
