R/weighted_sd.R

In TAM: Test Analysis Modules

Defines functions weighted_sd

Documented in weighted_sd

## File Name: weighted_sd.R
## File Version: 0.08



# weighted standard deviation
weighted_sd <- function( x, w=rep(1,length(x) ), method="unbiased",
        select=NULL)
{
    res <- sqrt( weighted_var(x=x, w=w, method=method, select=select) )
    return(res)
}

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