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}
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}
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\arguments{
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\arguments{
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  \item{x}{A univariate or multivariate time series.}
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  \item{x}{A univariate or multivariate time series.}
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  \item{method}{String specifying the method used to estimate the
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  \item{method}{String specifying the method used to estimate the
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    spectral density.  Allowed methods are \code{"pgram"} (the default)
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    spectral density.  Allowed methods are \code{"pgram"} (the default)
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    and \code{"ar"}.}
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    and \code{"ar"}.}
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  \item{\dots}{Further arguments to specific spec methods or
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  \item{\dots}{Further arguments to specific spec methods or
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    \code{plot.spec}.}
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    \code{plot.spec}.}
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}
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}
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\value{
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\value{
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  An object of class \code{"spec"}, which is a list containing at
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  An object of class \code{"spec"}, which is a list containing at
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  The result is returned invisibly if \code{plot} is true.
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  The result is returned invisibly if \code{plot} is true.
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}
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}
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\details{
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\details{
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  \code{spectrum} is a wrapper function which calls the methods
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  \code{spectrum} is a wrapper function which calls the methods
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  \code{\link{spec.pgram}} and \code{\link{spec.ar}}.
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  \code{\link{spec.pgram}} and \code{\link{spec.ar}}.
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  The spectrum here is defined with scaling \code{1/\link{frequency}(x)},
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  The spectrum here is defined with scaling \code{1/\link{frequency}(x)},
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  following S-PLUS.  This makes the spectral density a density over the
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  following S-PLUS.  This makes the spectral density a density over the
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  range \code{(-frequency(x)/2, +frequency(x)/2]}, whereas a more common
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  range \code{(-frequency(x)/2, +frequency(x)/2]}, whereas a more common
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  scaling is \eqn{2\pi}{2pi} and range \eqn{(-0.5, 0.5]} (e.g., Bloomfield)
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  scaling is \eqn{2\pi}{2pi} and range \eqn{(-0.5, 0.5]} (e.g., Bloomfield)
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  or 1 and range \eqn{(-\pi, \pi]}{(-pi, pi]}.
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  or 1 and range \eqn{(-\pi, \pi]}{(-pi, pi]}.
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  If available, a confidence interval will be plotted by
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  If available, a confidence interval will be plotted by
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  \code{plot.spec}: this is asymmetric, and the width of the centre
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  \code{plot.spec}: this is asymmetric, and the width of the centre
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  mark indicates the equivalent bandwidth.
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  mark indicates the equivalent bandwidth.
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}
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}
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\note{
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\note{