| pdfwak {lmomco} | R Documentation |
This function computes the probability density
of the Wakeby distribution given parameters (xi, α, β, gamma, and delta) of the distribution computed by pargev. The probability density function of the distribution is
f(x) = [α(1-F)^{β - 1} + gamma(1-F)^{-delta - 1}]^-1mbox{,}
where f(x) is the probability density for quantile x,xi is a location parameter, α and β
are scale parameters, and gamma, and delta are
shape parameters. The five returned parameters from parwak in order
are xi, α, β, gamma, and delta.
pdfwak(x, para)
x |
A real value. |
para |
The parameters from parwak or similar. |
Probability density (f) for x.
W.H. Asquith
Hosking, J.R.M. and Wallis, J.R., 1997, Regional frequency analysis—An approach based on L-moments: Cambridge University Press.
Sourced from written communication with Dr. Hosking in October 2007.
lmr <- vec2lmom(c(1,0.5,.4,.3,.15)) wak <- parwak(lmr) F <- nonexceeds() x <- quawak(F,wak) check.pdf(pdfwak,wak,plot=TRUE)