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.
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.
Details
The R base function range returns the minimum and maximum value of a numeric object. Here we return the span of a (possibly trimmed) numeric vector, say the difference of maximum and minimum value.