Generic function for the (trimmed) arithmetic mean.

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`x` |
An |

`trim` |
the fraction (0 to 0.5) of observations to be
trimmed from each end of |

`na.rm` |
a logical value indicating whether |

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

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.

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

`weighted.mean`

, `mean.POSIXct`

,
`colMeans`

for row and column means.

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