sd {stats}R Documentation

Standard Deviation


This function computes the standard deviation of the values in x. If na.rm is TRUE then missing values are removed before computation proceeds. If x is a matrix or a data frame, a vector of the standard deviation of the columns is returned.


sd(x, na.rm = FALSE)


x a numeric vector, matrix or data frame.
na.rm logical. Should missing values be removed?

See Also

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


sd(1:2) ^ 2

[Package stats version 2.2.1 Index]