sd                   package: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. If `x' is a matrix or a dataframe, a vector
     of the standard deviation of the columns is returned.

Usage:

     sd(x, na.rm = FALSE)

Arguments:

       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.

Examples:

     sd(1:2) ^ 2

