Generic function for the (trimmed) arithmetic mean.
mean(x, ...) ## S3 method for class 'default': mean((x, trim = 0, na.rm = FALSE, ...))
- 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.
- the fraction (0 to 0.5) of observations to be trimmed from each end of
xbefore the mean is computed. Values of trim outside that range are taken as the nearest endpoint.
- a logical value indicating whether
NAvalues should be stripped before the computation proceeds.
- further arguments passed to or from other methods.
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.
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.
Documentation reproduced from R 3.0.2. License: GPL-2.