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  the estimate of the standard error, unless that is zero where it
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  the estimate of the standard error, unless that is zero where it
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  returns \code{1}.
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  returns \code{1}.
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  \code{nclass.FD} uses the Freedman-Diaconis choice based on the
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  \code{nclass.FD} uses the Freedman-Diaconis choice based on the
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  inter-quartile range (\code{\link{IQR}}) unless that's zero where it
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  inter-quartile range (\code{\link{IQR}}) unless that's zero where it
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  reverts to \code{\link{mad}(x, constant=2)} and when that is \eqn{0}
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  reverts to \code{\link{mad}(x, constant = 2)} and when that is \eqn{0}
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  as well, returns \code{1}.
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  as well, returns \code{1}.
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}
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}
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\references{
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\references{
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  Venables, W. N. and Ripley, B. D. (2002)
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  Venables, W. N. and Ripley, B. D. (2002)
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  \emph{Modern Applied Statistics with S-PLUS.}
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  \emph{Modern Applied Statistics with S-PLUS.}