This function converts a vector of L-moments to a L-moment object of lmomco. The object is an R list. This function is intended to facilitate the use of L-moments (and TL-moments) that the user might have from other sources. L-moments and L-moment ratios of arbitrary length are supported.
Because in typical practice, the \(k \ge 3\) order L-moments are dimensionless ratios (\(\tau_3\), \(\tau_4\), and \(\tau_5\)), this function computes \(\lambda_3\), \(\lambda_4\), \(\lambda_5\) from \(\lambda_2\) from the ratios. However, typical practice is not set on the use of \(\lambda_2\) or \(\tau\) as measure of dispersion. Therefore, this function takes an lscale optional logical (TRUE|FALSE) argument---if \(\lambda_2\) is provided and lscale=TRUE, then \(\tau\) is computed by the function and if \(\tau\) is provided, then \(\lambda_2\) is computed by the function.
vec2lmom(vec, lscale=TRUE,
trim=NULL, leftrim=NULL, rightrim=NULL, checklmom=TRUE)An R
list is returned.
A vector of L-moment values in \(\lambda_1\), \(\lambda_2\) or \(\tau\), \(\tau_3\), \(\tau_4\), and \(\tau_5\) order.
A logical switch on the type of the second value of first argument.
L-scale (\(\lambda_2\)) or LCV (\(\tau\)). Default is TRUE,
the second value in the first argument is \(\lambda_2\).
Level of symmetrical trimming, which should equal NULL if asymmetrical trimming is used.
Level of trimming of the left-tail of the sample, which will equal NULL even if trim = 1 if the trimming is symmetrical.
Level of trimming of the right-tail of the sample, which will equal NULL even if trim = 1 if the trimming is symmetrical.
Should the lmom be checked for validity using the are.lmom.valid function. Normally this should be left as the default unless TL-moments are being constructed in lieu of using vec2TLmom.
W.H. Asquith
lmoms, vec2pwm
lmr <- vec2lmom(c(12,0.6,0.34,0.20,0.05),lscale=FALSE)
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