parTLgpa: Estimate the Parameters of the Generalized Pareto Distribution using Trimmed L-moments
Description
This function estimates the parameters of the Generalized Pareto distribution given
the the trimmed L-moments (TL-moments) for \(t=1\) of the data in TL-moment object with a trim level of unity (trim=1). The parameters are computed as
$$\kappa = \frac{10-45\tau^{(1)}_3}{9\tau^{(1)}_3+10} \mbox{,}$$
$$\alpha = \frac{1}{6}\lambda^{(1)}_2(\kappa+2)(\kappa+3)(\kappa+4) \mbox{, and}$$
$$\xi = \lambda^{(1)}_1 - \frac{\alpha(\kappa+5)}{(\kappa+2)(\kappa+3)} \mbox{.}$$
Usage
parTLgpa(lmom, ...)
Value
An R
list is returned.
type
The type of distribution: gpa.
para
The parameters of the distribution.
source
The source of the parameters: “parTLgpa”.
Arguments
lmom
A TL-moment object created by TLmoms.
...
Other arguments to pass.
Author
W.H. Asquith
References
Elamir, E.A.H., and Seheult, A.H., 2003, Trimmed L-moments: Computational Statistics and Data Analysis, v. 43, pp. 299--314.