find_phi {smile}

Find phi parameter for the Exponential spatial auto-correlation function

Description

Function designed to find the phi parameter such that the correlation between points within a given distance d is at most a given value.

Usage

find_phi(
  d,
  nu,
  kappa,
  mu2,
  family = "matern",
  range = c(1e-04, 1000),
  cut = 0.05
)

Arguments

d

maximum distance for spatial dependence equal to cut.

nu

smoothness parameter associated with the Matern cov. function.

kappa

one of the smoothness parameters associated with the Generalized Wendland covariance function

mu2

one of the smoothness parameters associated with the Generalized Wendland covariance function

family

covariance function family, the options are c("matern", "gw", "cs", "spher", "pexp", "gaussian").

range

Minimum and maximum distance to be considered. The default is range = c(1e-04, 1000).

cut

desired spatial correlation at a distance d, the default is cut = .05.

Value

a numeric value indicating the range parameter such that the spatial correlation between two points at distance d is cut.