# mean {base}

### Description

Generic function for the (trimmed) arithmetic mean.

### Usage

mean(x, ...) ## S3 method for class 'default': mean((x, trim = 0, na.rm = FALSE, ...))

### Arguments

- x
- An R object. Currently there are methods for numeric/logical vectors and date, date-time and time interval objects. Complex vectors are 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. Values of trim outside that range are taken as the nearest endpoint. - na.rm
- a logical value indicating whether
`NA`

values should be stripped before the computation proceeds. - ...
- further arguments passed to or from other methods.

### Values

If `trim`

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

is computed, as a numeric or complex vector of length one. If `x`

is not logical (coerced to numeric), numeric (including integer) or complex, `NA_real_`

is returned, with a warning.

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`

, `colMeans`

for row and column means.

Documentation reproduced from R 3.0.2. License: GPL-2.