are.lmom.valid {lmomco}R Documentation

Are the L-moments valid

Description

The second through fifth order L-moments are perhaps the most common in analysis situations. These L-moments have particular constraints on magnitudes and relation to each other. This function evaluates and L-moment object whether the bounds for L-scale (λ_2 > 0), L-skew (|tau_3| < 1), L-kurtosis (0.25(5tau_3^2 - 1) <= tau_4 < 1), and |tau_5| < 1 are satisfied.

Usage

are.lmom.valid(lmom)

Arguments

lmom A L-moment object created by lmom.ub or pwm2lmom.

Value

TRUE L-moments are valid.
FALSE L-moments are not valid.

Author(s)

W.H. Asquith

References

Hosking, J.R.M., 1990, L-moments—Analysis and estimation of distributions using linear combinations of order statistics: Journal of the Royal Statistical Society, Series B, vol. 52, p. 105-124.

Hosking, J.R.M. and Wallis, J.R., 1997, Regional frequency analysis—An approach based on L-moments: Cambridge University Press.

See Also

lmom.ub, lmoms, and pwm2lmom

Examples

lmr <- lmom.ub(rnorm(20))
if(are.lmom.valid(lmr)) print("They are.")

[Package lmomco version 0.96.3 Index]