Performs adjusted inferences based on model objects fitted, using
maximum likelihood estimation, by the extreme value analysis packages
'evd' < https://cran.r-project.org/package=evd>,
'evir' < https://cran.r-project.org/package=evir>,
'extRemes' < https://cran.r-project.org/package=extRemes>,
'fExtremes' < https://cran.r-project.org/package=fExtremes>,
'ismev' < https://cran.r-project.org/package=ismev>,
'mev' < https://cran.r-project.org/package=mev>,
'POT' < https://cran.r-project.org/package=POT> and
'texmex' < https://cran.r-project.org/package=texmex>.
Adjusted standard errors and an adjusted loglikelihood are provided, using
the 'chandwich' package < https://cran.r-project.org/package=chandwich>
and the object-oriented features of the 'sandwich' package
< https://cran.r-project.org/package=sandwich>. The adjustment is based on a
robust sandwich estimator of the parameter covariance matrix, based on the
methodology in Chandler and Bate (2007)