R: Weighted Arithmetic Mean

weighted.mean {base}

R Documentation

Weighted Arithmetic Mean

Compute a weighted mean of a numeric vector.

weighted.mean(x, w, na.rm=FALSE)

x

a numeric vector containing the values whose mean is to be computed.

w

a vector of weights the same length as x giving the weights to use for each element of x.

na.rm

a logical value indicating whether NA values in x should be stripped before the computation proceeds.

If w is missing then all elements of x are given the same weight.

Missing values in w are not handled.

## GPA from Siegel 1994
wt <- c(5,  5,  4,  1)/15
x <- c(3.7,3.3,3.5,2.8)
xm <- weighted.mean(x,wt)