mean {base} | R Documentation |

## Arithmetic Mean

### Description

Generic function for the (trimmed) arithmetic mean.

### Usage

mean(x, ...)
## Default S3 method:
mean(x, trim = 0, na.rm = FALSE, ...)

### Arguments

`x` |
An **R** object. Currently there are methods for numeric data
frames, numeric vectors and dates. A complex vector is allowed for
`trim = 0` , only. |

`trim` |
the fraction (0 to 0.5) of observations to be
trimmed from each end of `x` before the mean is computed. |

`na.rm` |
a logical value indicating whether `NA`
values should be stripped before the computation proceeds. |

`...` |
further arguments passed to or from other methods. |

### Value

For a data frame, a named vector with the appropriate method being
applied column by column.

If `trim`

is zero (the default),
the arithmetic mean of the values in `x`

is computed.

If `trim`

is non-zero, a symmetrically trimmed mean is computed
with a fraction of `trim`

observations deleted from each end
before the mean is computed.

### References

Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988)
*The New S Language*.
Wadsworth & Brooks/Cole.

### See Also

`weighted.mean`

, `mean.POSIXct`

### Examples

x <- c(0:10, 50)
xm <- mean(x)
c(xm, mean(x, trim = 0.10))
mean(USArrests, trim = 0.2)

[Package

*base* version 2.2.1

Index]