R: Arithmetic Mean

mean {base} | R Documentation

## Arithmetic Mean

### Description

Generic function for the (trimmed) arithmetic mean.

### Usage

    mean(x, ...)
    mean.default(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.

### See Also

`weighted.mean`, `mean.POSIXct`

### Examples

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

    all.equal(mean(x, trim = 0.5), median(x))

    data(USArrests)
    mean(USArrests, trim = 0.2)

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