For S-FFA only: Estimates the parameters of a stationary probability model
using the L-moments.
Usage
fit_lmoments(data, distribution)
Value
A list containing the results of parameter estimation:
data: The data argument.
distribution: The distribution argument.
method: "L-moments".
params: Numeric vector of estimated parameters.
Arguments
data
Numeric vector of observed annual maximum series values.
Must be strictly positive, finite, and not missing.
distribution
A three-character code indicating the distribution family.
Must be "GUM", "NOR", "LNO", "GEV", "GLO", "GNO", "PE3", "LP3",
or "WEI".
Details
First, the sample L-moments of the data are computed using utils_sample_lmoments().
Then, formulas from Hosking (1997) are used to match the parameters to
the sample L-moments. The distributions "GNO", "PE3", and "LP3" use a
rational approximation of the parameters since no closed-form expression is known.
References
Hosking, J.R.M. & Wallis, J.R., 1997. Regional frequency analysis: an approach based
on L-Moments. Cambridge University Press, New York, USA.