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  \code{"\link{Date}"}.
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  \code{"\link{Date}"}.
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  \code{\link{NA}}'s propagate.
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  \code{\link{NA}}'s propagate.
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}
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}
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\value{
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\value{
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  If \code{x} is a vector of length \code{n} and \code{differences=1},
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  If \code{x} is a vector of length \code{n} and \code{differences = 1},
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  then the computed result is equal to the successive differences
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  then the computed result is equal to the successive differences
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  \code{x[(1+lag):n] - x[1:(n-lag)]}.
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  \code{x[(1+lag):n] - x[1:(n-lag)]}.
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  If \code{difference} is larger than one this algorithm is applied
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  If \code{difference} is larger than one this algorithm is applied
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  recursively to \code{x}.
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  recursively to \code{x}.