muStat: stdev – R documentation

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stdev

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

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

muStat

Prentice Rank Sum Test and McNemar Test

v1.7.0

GPL (>= 2)

Authors

Knut M. Wittkowski <kmw@rockefeller.edu> and Tingting Song <ttsong@gmail.com>

Initial release

2010-09-17