Giving 2 sub_models, build a correlated bivaraite operator based on K = D(theta, eta) $$D(\theta, \rho) = \begin{pmatrix} \cos(\theta) + \rho \sin(\theta) & -\sin(\theta) \sqrt{1+\rho^2} \\ \sin(\theta) - \rho \cos(\theta) & \cos(\theta) \sqrt{1+\rho^2} \end{pmatrix}$$
bv_matern_nig(
mesh,
sub_models,
theta = 0,
rho = 0,
sd1 = 1,
sd2 = 1,
group = NULL,
share_param = FALSE,
fix_bv_theta = FALSE,
...
)
mesh for build the model
a list of sub_models (should be two matern models)
the parameter related to rotation
the parameter related to correlation
group vector, can be inherited from ngme() function
TRUE if share the same parameter for 2 sub_models (of same type)
ignore
a list of specification of model