R: Plots the extremal coefficient

extcoeff {SpatialExtremes} | R Documentation

## 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 covariance family with the Schlather's model. May be missing if `fitted` is given.
`param` | Numeric vector of length 3. The parameters for the Smith's or Schlather model - i.e. c(cov11, cov12, cov22) or c(nugget, 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.

### Author(s)

Mathieu Ribatet

### 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", nugget = 0, range =
    3, smooth = 1)

    ## 2- Fit a max-stable processes
    schlather <- fitmaxstab(data, locations, "whitmat", nugget = 0)

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

[Package SpatialExtremes version 2.0-5 Index]