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Mean: (Weighted) Arithmetic Mean

Description

Generic function for the (trimmed) arithmetic mean, possibly with given weights.

Usage

Mean(x, ...)

# S3 method for Freq Mean(x, breaks, ...)

# S3 method for default Mean(x, weights = NULL, trim = 0, na.rm = FALSE, ...)

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.

trim and weights can't be used together at the same time.

Arguments

x

An 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.

...

further arguments passed to or from other methods.

breaks

breaks for calculating the mean for classified data as composed by Freq.

weights

a numerical vector of weights the same length as x giving the weights to use for elements of x.

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.

References

Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language. Wadsworth & Brooks/Cole.

See Also

weighted.mean, mean.POSIXct, colMeans for row and column means.

Examples

Run this code

  x <- c(0:10, 50)
  xm <- Mean(x)
  c(xm, Mean(x, trim = 0.10))

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