| % File src/library/stats/man/sd.Rd |
| % Part of the R package, https://www.R-project.org |
| % Copyright 1995-2018 R Core Team |
| % Distributed under GPL 2 or later |
| |
| \name{sd} |
| \alias{sd} |
| \title{Standard Deviation} |
| \description{ |
| This function computes the standard deviation of the values in |
| \code{x}. |
| If \code{na.rm} is \code{TRUE} then missing values are removed before |
| computation proceeds. |
| } |
| \usage{ |
| sd(x, na.rm = FALSE) |
| } |
| \arguments{ |
| \item{x}{a numeric vector or an \R object but not a |
| \code{\link{factor}} coercible to numeric by \code{as.double(x)}.} |
| \item{na.rm}{logical. Should missing values be removed?} |
| } |
| \details{ |
| Like \code{\link{var}} this uses denominator \eqn{n - 1}. |
| |
| The standard deviation of a length-one or zero-length vector is \code{NA}. |
| } |
| \seealso{ |
| \code{\link{var}} for its square, and \code{\link{mad}}, the most |
| robust alternative. |
| } |
| \examples{ |
| sd(1:2) ^ 2 |
| } |
| \keyword{univar} |