Generic function for the (trimmed) arithmetic mean.
Usage
mean(x, …)
# S3 method for 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.
Value
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.