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Computes the weighted standard deviation of a distribution.
weighted.sd(x, weights = NULL, na.rm = FALSE)
a length-one numeric vector
numeric vector
numeric vector of weights. If NULL (default), uniform weights (i.e. all equal to 1) are used.
logical, indicating whether NA values should be silently removed before the computation proceeds. Default is FALSE.
Nicolas Robette
weighted.cor
data(Movies) weighted.sd(Movies$Critics, weights = rep(c(.8,1.2), 500))
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