Generic function for the (trimmed) arithmetic mean, possibly with given weights.
# S3 method for Freq Mean(x, breaks, ...)
# S3 method for default Mean(x, weights = NULL, trim = 0, na.rm = FALSE, ...)
trim is zero (the default), the arithmetic mean of the
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.
weights can't be used together at the same time.
a numerical vector of weights the same length as
x giving the weights to use for elements of
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.
breaks for calculating the mean for classified data as composed by
a logical value indicating whether
values should be stripped before the computation proceeds.
further arguments passed to or from other methods.
Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language. Wadsworth & Brooks/Cole.