A variation of `ecdf()`

that can be applied to weighted samples.

## Arguments

- x
numeric vector: sample values

- weights
Weights for the sample. One of:

numeric vector of same length as

`x`

: weights for corresponding values in`x`

, which will be normalized to sum to 1.`NULL`

: indicates no weights are provided, so the unweighted empirical cumulative distribution function (equivalent to`ecdf()`

) is returned.

- na.rm
logical: if

`TRUE`

, corresponding entries in`x`

and`weights`

are removed if either is`NA`

.

## Value

`weighted_ecdf()`

returns a function of class `"weighted_ecdf"`

, which also
inherits from the `stepfun()`

class. Thus, it also has `plot()`

and `print()`

methods. Like `ecdf()`

, `weighted_ecdf()`

also provides a `quantile()`

method,
which dispatches to `weighted_quantile()`

.

## Details

Generates a weighted empirical cumulative distribution function, \(F(x)\).
Given \(x\), a sorted vector (derived from `x`

), and \(w_i\), the corresponding
`weight`

for \(x_i\), \(F(x)\) is a step function with steps at each \(x_i\)
with \(F(x_i)\) equal to the sum of all weights up to and including \(w_i\).