sd: Standard Deviation

Description Usage Arguments Details See Also Examples

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

1
sd(x, na.rm = FALSE)

Arguments

x

a numeric vector or an R object which is coercible to one 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 zero-length vector (after removal of NAs if na.rm = TRUE) is not defined and gives an error. The standard deviation of a length-one vector is NA.

See Also

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

Examples

1
sd(1:2) ^ 2