R: Standard Deviation

stdev {muStat} | R Documentation

## Standard Deviation

### Description

stdev 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. If unbiased is TRUE then the sample standard deviation is returned, else the population standard deviation is returned.

### Usage

    stdev(x, na.rm, unbiased)

### Arguments

`x` | a numeric vector, matrix or data frame
`na.rm` | logical value indicating if missing values should be removed.
`unbiased` | whether to return biased or unbiased standard deviation

### Value

Standard deviation of x.

### Author(s)

Knut M. Wittkowski kmw@rockefeller.edu

### See Also

`sd`, `var`

### Examples

    x <- c(1, 4, NA, 0, 5)
    stdev(x, na.rm=TRUE, unbiased=TRUE)
    # [1] 2.380476
    stdev(x, na.rm=TRUE, unbiased=FALSE)
    # [1] 1.904381

[Package muStat version 1.7.0 Index]