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The vector of weights w is relative since the formula is:
w
a_amean(x, w)
The weighted mean as a scalar value
A numeric vector.
A vector of numeric weights of the same length as x.
x
$$ y = \frac{1}{\sum w_i} \sum w_i x_i $$
If x contains NAs, these x values and the corresponding w values are removed before applying the formula above.
NA
x <- c(1:10) w <- c(10:1) a_amean(x,w)
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