sd {stats} 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)


### 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?

### Details

Like var this uses denominator n - 1.

The standard deviation of a length-one or zero-length vector is NA.

var for its square, and mad, the most robust alternative.
sd(1:2) ^ 2