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  Like \code{\link{var}} this uses denominator \eqn{n - 1}.
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  Like \code{\link{var}} this uses denominator \eqn{n - 1}.
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  The standard deviation of a zero-length vector (after removal of
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  The standard deviation of a zero-length vector (after removal of
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  \code{NA}s if \code{na.rm = TRUE}) is not defined and gives an error.
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  \code{NA}s if \code{na.rm = TRUE}) is not defined and gives an error.
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  The standard deviation of a length-one vector is \code{NA}.
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  The standard deviation of a length-one vector is \code{NA}.
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  Prior to \R 2.14.0, \code{sd(dfrm)} worked directly for a
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  \link{data.frame} \code{dfrm}.  This is now deprecated and you are
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  expected to use \code{\link{sapply}(dfrm, sd)}.
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}
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}
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\seealso{
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\seealso{
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  \code{\link{var}} for its square, and \code{\link{mad}}, the most
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  \code{\link{var}} for its square, and \code{\link{mad}}, the most
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  robust alternative.
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  robust alternative.
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}
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}