Generalized jackknife shape estimator
shape.genjack(xdat, k)a data frame with the number of order statistics k and the shape parameter estimate shape, or a single numeric value if k is a scalar integer.
vector of positive observations
vector of order statistics; if missing, a vector going from 10 to sample size minus one.
Gomes, I.M., João Martins, M. and Neves, M. (2000) Alternatives to a Semi-Parametric Estimator of Parameters of Rare Events-The Jackknife Methodology. Extremes, 3, 207–229. tools:::Rd_expr_doi("10.1023/A:1011470010228")