usd function

Unbiased standard deviation

This function computes the unbiased standard deviation of the values in x. If na.rm is TRUE then missing values are removed before computation proceeds.

usd(x, na.rm = FALSE)

Arguments

• x: a numeric vector or an R object but not a factor coercible to numeric by as.double(x)
• na.rm: logical. Should missing values be removed?

Returns

A scalar

Details

Like var this uses denominator n - 1. The standard deviation of a length-one or zero-length vector is NA.

Examples

sd(1:5)
usd(1:5)