SpatialExtremes (version 1.4-0)

extcoeff: Plots the extremal coefficient

Description

Plots the extremal coefficient evolution as the coordinates evolves.

Usage

extcoeff(fitted, cov.mod, param, n = 200, xlab, ylab, ...)

Arguments

fitted

A object of class "maxstab". Most often, it will be the output of the function fitmaxstab. If missing, then cov.mod and param should be supplied.

cov.mod

A character string corresponding the the covariance model in the max-stable representation. Must be one of "gauss" for the Smith's model; or "whitmat", "cauchy" or "powexp" for the Whittle-Matern, the Cauchy and the Powered Exponential cov

param

Numeric vector of length 3. The parameters for the Smith's or Schlather model - i.e. c(cov11, cov12, cov22) or c(sill, range, smooth). Please respect this order.

n

Numeric. n^2 corresponds to the total number of estimated extremal coefficients for the contour plot.

xlab,ylab

The x-axis and y-axis labels. May be missing.

...

Several options to be passed to the contour function.

Value

• A plot.

See Also

fitmaxstab

Examples

## 1- Random field generation
n.site <- 30
locations <- matrix(runif(2*n.site, 0, 10), ncol = 2)
colnames(locations) <- c("lon", "lat")

data <- rmaxstab(60, locations, cov.mod = "whitmat", sill = 1, range =
3, smooth = 1)

## 2- Fit a max-stable processes
schlather <- fitmaxstab(data, locations, "whitmat",
                        fit.marge = FALSE)

## 3- Plot the extremal coefficient
extcoeff(schlather)