weighted.mean {stats} | 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)

[Package

*stats* version 2.5.0

Index]