GEVAM: Generalised extreme value distribution - estimates directly...
In UKFE: UK Flood Estimation

GEVAM

R Documentation

Generalised extreme value distribution - estimates directly from sample

Description

Estimated quantiles as function of return period (RP) and vice versa, directly from the data

Usage

GEVAM(x, RP = 100, q = NULL)

Arguments

`x`	numeric vector (block maxima sample)
`RP`	return period (default = 100)
`q`	quantile (magnitude of variable)

Details

If the argument q is used, it overrides RP and provides RP as a function of q (magnitude of variable) as opposed to q as a function of RP. The parameters are estimated by the method of L-moments, as detailed in 'Hosking J. Wallis J. 1997 Regional Frequency Analysis: An Approach Based on L-moments. Cambridge University Press, New York'.

Value

quantile as a function of RP or vice versa.

Author(s)

Anthony Hammond

Examples

#Get an annual maximum sample and estimate the 50-year RP
AM.27090 <- GetAM(27090)
GEVAM(AM.27090$Flow, RP = 50)
#Estimate the RP for a 600m3/s discharge
GEVAM(AM.27090$Flow, q = 600)

UKFE documentation built on April 4, 2025, 12:55 a.m.