R: Weighted Arithmetic Mean

weighted.mean {base} | R Documentation

## Weighted Arithmetic Mean

### Description

Compute a weighted mean of a numeric vector.

### Usage

    weighted.mean(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.

### Details

If `w` is missing then all elements of `x` are given the same weight.

Missing values in `w` are not handled.

### See Also

`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.mean(x,wt)

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