quantile when the values are weighted
weighted_quantile(v, w = NULL, p = (0:4)/4, v_is_sorted = FALSE)A vector from which sample quantiles are desired.
Weights corresponding to each v.
Numeric vector of probabilities. Missing values or values outside \([0, 1]\) raise an error.
(logical, default: FALSE) If TRUE, ordering
v is assumed to be sorted. Only set to TRUE when it is certain
that v is sorted (as within groups of tables).
A vector the same length as p, the quantiles corresponding
to each element of p.