Description Usage Arguments Details Value Author(s) References See Also Examples
This function allows for computing the weighted mean and weighted variance of a vector of continuous values.
1  weighted.meanvar(x, w, na.rm = FALSE)

x 
an object containing the values whose weighted mean is to be computed. 
w 
a numerical vector of weights of the same length as 
na.rm 

If w
is missing then all elements of x
are given the same weight, otherwise the weights coerced to numeric by as.numeric
. On the contrary of weighted.mean the weights are NOT normalized to sum to one. If the sum of the weights is zero or infinite, NAs will be returned.
A numeric vector of two values that are the weighted mean and weighted variance respectively.
Benjamin HaibeKains
http://en.wikipedia.org/wiki/Weighted_variance#Weighted_sample_variance
weighted.mean
1 2  set.seed(54321)
weighted.meanvar(x=rnorm(100) + 10, w=runif(100))

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