limma (version 3.28.6)

weighted.median: Weighted Median

Description

Compute a weighted median of a numeric vector.

Usage

weighted.median(x, w, na.rm = FALSE)

Arguments

x

a numeric vector containing the values whose mean is to be computed.

w

a vector of weights the same length as x giving the weights to use for each element of x.

na.rm

a logical value indicating whether NA values in x should be stripped before the computation proceeds.

Value

• numeric value giving the weighted median

Details

If w is missing then all elements of x are given the same weight. Missing values in w are not handled. The weighted median is the median of the discrete distribution with values given by x and probabilities given by w/sum(w).

See Also

median, weighted.mean

Examples

## GPA from Siegel 1994
wt <- c(5,  5,  4,  1)/15
x <- c(3.7,3.3,3.5,2.8)
xm <- weighted.median(x,wt)