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  \item{type}{The type of correlation (same as the \code{type}
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  \item{type}{The type of correlation (same as the \code{type}
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    argument).}
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    argument).}
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  \item{n.used}{The number of observations in the time series.}
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  \item{n.used}{The number of observations in the time series.}
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  \item{series}{The name of the series \code{x}.}
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  \item{series}{The name of the series \code{x}.}
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  \item{snames}{The series names for a multivariate time series.}
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  \item{snames}{The series names for a multivariate time series.}
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  The lag \code{k} value returned by \code{ccf(x, y)} estimates the
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  The lag \code{k} value returned by \code{ccf(x, y)} estimates the
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  correlation between \code{x[t+k]} and \code{y[t]}.
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  correlation between \code{x[t+k]} and \code{y[t]}.
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  The result is returned invisibly if \code{plot} is \code{TRUE}.
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  The result is returned invisibly if \code{plot} is \code{TRUE}.
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}
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}