This help topic is for R version 0.60. For the current version of R, try https://stat.ethz.ch/R-manual/R-patched/library/base/html/sd.html
sd {base}R Documentation

Standard Deviation

Description

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

Usage

sd(x, na.rm = FALSE)

See Also

var for its square, and mad, the most robust alternative.

Examples

sd(1:2) ^ 2
[Package base version 0.60 ]