sd 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 |
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.
See Also
var for its square, and mad, the most robust alternative.
Examples
sd(1:2) ^ 2
Copyright (©) 1999–2012 R Foundation for Statistical Computing.
Licensed under the GNU General Public License.