Matrix or data frame each of whose rows contains the $L$-moments
and $L$-moment ratios for one site, in the order $\ell_1$,
$\ell_2$, $t_3$, $t_4$, etc.
weight
Vector containing the weights to be used for each site.
If omitted, equal weights will be used.
Value
Vector containing the regional average $L$-moments.