weighted.sd {vtable}

Weighted standard deviation

Description

This is a basic weighted standard deviation function, mainly for internal use with sumtable. For a more fully-fledged weighted SD function, see Hmisc::wtd.var, although it uses a slightly differend degree-of-freedom correction.

Usage

weighted.sd(x, w, na.rm = TRUE)

Arguments

x

A numeric vector.

w

A vector of weights. Negative weights are not allowed.

na.rm

Set to TRUE to remove indices with missing values in x or w.

Examples

x <- c(1, 1, 2, 3, 4, 4, 4)
w <- c(4, 1, 3, 7, 0, 2, 5)
weighted.sd(x, w)