| mean {base} | R Documentation |
Generic function for the (trimmed) arithmetic mean.
mean(x, ...) ## Default S3 method: mean(x, trim = 0, na.rm = FALSE, ...)
x |
An R object. Currently there are methods for
numeric/logical vectors and date,
date-time and time interval objects, and for data
frames all of whose columns have a method. 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. |
For a data frame, a named vector with the appropriate method being
applied column by column.
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 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.
x <- c(0:10, 50) xm <- mean(x) c(xm, mean(x, trim = 0.10)) mean(USArrests, trim = 0.2)