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  (centered and possibly scaled) data matrix, not by using
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  (centered and possibly scaled) data matrix, not by using
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  \code{eigen} on the covariance matrix.  This
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  \code{eigen} on the covariance matrix.  This
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  is generally the preferred method for numerical accuracy.  The
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  is generally the preferred method for numerical accuracy.  The
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  \code{print} method for these objects prints the results in a nice
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  \code{print} method for these objects prints the results in a nice
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  format and the \code{plot} method produces a scree plot.
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  format and the \code{plot} method produces a scree plot.
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  Unlike \code{\link{princomp}}, variances are computed with the usual
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  Unlike \code{\link{princomp}}, variances are computed with the usual
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  divisor \eqn{N - 1}.
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  divisor \eqn{N - 1}.
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  Note that \code{scale = TRUE} cannot be used if there are zero or
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  Note that \code{scale = TRUE} cannot be used if there are zero or
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  constant (for \code{center = TRUE}) variables.
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  constant (for \code{center = TRUE}) variables.
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}
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}
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\note{
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\note{
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  The signs of the columns of the rotation matrix are arbitrary, and
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  The signs of the columns of the rotation matrix are arbitrary, and