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  \code{bw.nrd0} implements a rule-of-thumb for
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  \code{bw.nrd0} implements a rule-of-thumb for
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  choosing the bandwidth of a Gaussian kernel density estimator.
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  choosing the bandwidth of a Gaussian kernel density estimator.
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  It defaults to 0.9 times the
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  It defaults to 0.9 times the
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  minimum of the standard deviation and the interquartile range divided by
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  minimum of the standard deviation and the interquartile range divided by
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  1.34 times the sample size to the negative one-fifth power
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  1.34 times the sample size to the negative one-fifth power
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  (= Silverman's \sQuote{rule of thumb}, Silverman (1986, page 48, eqn (3.31))
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  (= Silverman's \sQuote{rule of thumb}, Silverman (1986, page 48, eqn (3.31)))
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  \emph{unless} the quartiles coincide when a positive result
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  \emph{unless} the quartiles coincide when a positive result
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  will be guaranteed.
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  will be guaranteed.
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  \code{bw.nrd} is the more common variation given by Scott (1992),
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  \code{bw.nrd} is the more common variation given by Scott (1992),
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  using factor 1.06.
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  using factor 1.06.