likmgp: Likelihood for multivariate peaks over threshold models

In mev: Modelling of Extreme Values

Likelihood for multivariate peaks over threshold models

Description

Likelihood for the various parametric limiting models over region determined by

\{y \in F: \max_{j=1}^D \sigma_j \frac{y^\xi_j-1}{\xi_j}+\mu_j > u\};

where \mu is loc, \sigma is scale and \xi is shape.

Usage

likmgp(
  dat,
  thresh,
  loc,
  scale,
  shape,
  par,
  model = c("log", "br", "xstud"),
  likt = c("mgp", "pois", "binom"),
  lambdau = 1,
  ...
)

Arguments

dat	matrix of observations
thresh	functional threshold for the maximum
loc	vector of location parameter for the marginal generalized Pareto distribution
scale	vector of scale parameter for the marginal generalized Pareto distribution
shape	vector of shape parameter for the marginal generalized Pareto distribution
par	list of parameters: alpha for the logistic model, Lambda for the Brown–Resnick model or else Sigma and df for the extremal Student.
model	string indicating the model family, one of "log", "neglog", "br" or "xstud"
likt	string indicating the type of likelihood, with an additional contribution for the non-exceeding components: one of "mgp", "binom" and "pois".
lambdau	vector of marginal rate of marginal threshold exceedance.
...	additional arguments (see Details)

Details

Optional arguments can be passed to the function via ...

• cl cluster instance created by makeCluster (default to NULL)

• ncors number of cores for parallel computing of the likelihood

• mmax maximum per column

• B1 number of replicates for quasi Monte Carlo integral for the exponent measure

• genvec1 generating vector for the quasi Monte Carlo routine (exponent measure), associated with B1

Value

the value of the log-likelihood with attributes expme, giving the exponent measure

Note

The location and scale parameters are not identifiable unless one of them is fixed.

mev documentation built on Sept. 11, 2024, 8:14 p.m.