UKFE (version 0.3.7)

Kappa3Est: Kappa3 distribution estimates from parameters

Description

Estimated quantiles as function of return period (RP) and vice versa, from user input parameters

Usage

Kappa3Est(loc, scale, shape, q = NULL, RP = 100)

Value

quantile as a function of RP or vice versa

Arguments

loc

location parameter

scale

scale parameter

shape

shape parameter

q

quantile. magnitude of the variable under consideration

RP

return period

Author

Anthony Hammond

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. This is the Kappa3 distribution as defined in Kjeldsen, T (2019), 'The 3-parameter Kappa distribution as an alternative for use with FEH pooling groups.'Circulation - The Newsletter of the British Hydrological Society, no. 142.

Examples

#Get an annual maximum sample, estimate the parameters and estimate 50-year RP
AM.27090 <- GetAM(27090)
#Get parameters and Store as an object
Pars <- as.numeric(Kappa3Pars(AM.27090$Flow))
#get estimate of 50-yr flow
Kappa3Est(Pars[1], Pars[2], Pars[3], RP = 50)
#Estimate the RP for a 600m3/s discharge
Kappa3Est(Pars[1], Pars[2], Pars[3], q = 600)