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  \item{na.rm}{logical.  Should missing values be removed?}
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  \item{na.rm}{logical.  Should missing values be removed?}
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}
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}
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\details{
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\details{
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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 length-one or zero-lengh vector is \code{NA}.
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  The standard deviation of a length-one or zero-length vector is \code{NA}.
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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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}