Computes the “unbiased” sample L-moments and L-moment
ratios of multiple sets of data stored in a list or matrix.
Following the paradigm of regional frequency analysis,
we regard the data sets as coming from different measurement sites.
Logical.
If TRUE, the second L-moment will be expressed
as a fraction of the mean, i.e. the computed value will be
the sample L-CV t=l_2/l_1.
If FALSE, the second L-moment will simply be
the sample L-scale value l_2.
Details
Sample L-moments are computed for each data set.
The calculations use samlmu internally.
If x is a list, each list element should contain data for one site
and the names of the list elements should be the site names.
If x is a matrix, each column should contain data for one site
and the column names should be the site names.
Value
An object of class regdata.
It is a data frame with columns "name" and "n",
containing respectively the site names and the
number of non-missing data values at each site,
and further columns containing the L-moments and L-moment ratios,
in the order l_1, t (or l_2),
t_3, t_4, etc.
Note
The default parameter values are chosen to be convenient
for the regional frequency analysis methods described by
Hosking and Wallis (1997).
Note that the number of L-moments and the choice
of whether to return L-CV or L-scale
are different from the defaults for samlmu.