qqextcoeff: QQ-plot for the extremal coefficient
In SpatialExtremes: Modelling Spatial Extremes

Description Usage Arguments Value Author(s) References See Also Examples

This function compares the extremal coefficients estimated from a fitted max-stable process to the ones estimated semi-parametrically.

1 2	qqextcoeff(fitted, estim = "ST", marge = "emp", xlab = "Semi-Empirical", ylab = "Model", ...)

`fitted`	An object of class `maxstab`. Most often, this will be the output of `fitmaxstab`, `fitcovmat` or `fitcovariance`.
`estim,marge`	The `estim` and `marge` options to be passed to the `fitextcoeff` function.
`xlab,ylab`	The x and y-axis labels.
`...`	Optional arguments to be passed to the `plot` function.

A QQ-plot.

Mathieu Ribatet

Schlather, M. (2002) Models for Stationary Max-Stable Random Fields. Extremes 5:1, 33–44.

Schlather, M. and Tawn, J. A. (2003) A dependence measure for multivariate and spatial extreme values: Properties and inference. Biometrika 90(1):139–156.

Smith, R. L. (1990) Max-stable processes and spatial extremes. Unpublished manuscript.

fitmaxstab, fitextcoeff

##Define the coordinate of each location
n.site <- 30
locations <- matrix(runif(2*n.site, 0, 10), ncol = 2)
colnames(locations) <- c("lon", "lat")

##Simulate a max-stable process - with unit Frechet margins
data <- rmaxstab(50, locations, cov.mod = "gauss", cov11 = 10, cov12 =
5, cov22 = 22)

fitted <- fitmaxstab(data, locations, "gauss")
qqextcoeff(fitted)