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  For normally \eqn{N(m,1)} distributed \eqn{X}, the expected value of
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  For normally \eqn{N(m,1)} distributed \eqn{X}, the expected value of
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  \code{IQR(X)} is \code{2*qnorm(3/4) = 1.3490}, i.e., for a normal-consistent
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  \code{IQR(X)} is \code{2*qnorm(3/4) = 1.3490}, i.e., for a normal-consistent
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  estimate of the standard deviation, use \code{IQR(x) / 1.349}.
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  estimate of the standard deviation, use \code{IQR(x) / 1.349}.
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}
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}
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\references{
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\references{
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  Tukey, J. W. (1977).
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  \bibshow{R:Tukey:1977}
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  \emph{Exploratory Data Analysis.}
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  Reading: Addison-Wesley.
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}
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}
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\seealso{
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\seealso{
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 \code{\link{fivenum}}, \code{\link{mad}} which is more robust,
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 \code{\link{fivenum}}, \code{\link{mad}} which is more robust,
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 \code{\link{range}}, \code{\link{quantile}}.
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 \code{\link{range}}, \code{\link{quantile}}.
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}
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}