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      which makes use of median \emph{updating} when one observation
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      which makes use of median \emph{updating} when one observation
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      enters and one leaves the smoothing window.  While this performs as
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      enters and one leaves the smoothing window.  While this performs as
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      \eqn{O(n \times k)}{O(n * k)} which is slower asymptotically, it is
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      \eqn{O(n \times k)}{O(n * k)} which is slower asymptotically, it is
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      considerably faster for small \eqn{k} or \eqn{n}.}
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      considerably faster for small \eqn{k} or \eqn{n}.}
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  }
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  }
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  Currently long vectors are only supported for \code{algorithm = "Steutzle"}.
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  Currently long vectors are only supported for \code{algorithm = "Steutzle"}.
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}
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}
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\references{
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\references{
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  \enc{Härdle}{Haerdle}, W. and Steiger, W. (1995)
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  \enc{Härdle}{Haerdle}, W. and Steiger, W. (1995)
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  [Algorithm AS 296] Optimal median smoothing,
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  [Algorithm AS 296] Optimal median smoothing,