SpatialExtremes (version 1.0-0)

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

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
require(RandomFields)
n.site <- 30
locations <- matrix(runif(2*n.site, 0, 10), ncol = 2)
colnames(locations) <- c("lon", "lat")

ms0 <- MaxStableRF(locations[,1], locations[,2], model = "wh",
                   grid = FALSE, maxstable = "extr",
                   param = c(0, 1, 0, 3, 1), n = 60)
ms0 <- t(ms0)

## 2- Fit a max-stable processes
schlather <- fitmaxstab(ms0, locations, "whitmat",
                        fit.marge = FALSE)

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