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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
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  so may differ between different programs for PCA, and even between
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  so may differ between different programs for PCA, and even between
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  different builds of \R.
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  different builds of \R.
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}
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}
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\references{
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\references{
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  \bibshow{R:Becker+Chambers+Wilks:1988}
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  \bibshow{R:Becker+Chambers+Wilks:1988,
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  Mardia, K. V., J. T. Kent, and J. M. Bibby (1979)
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    R:Mardia+Kent+Bibby:1979,
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  \emph{Multivariate Analysis}, London: Academic Press.
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  Venables, W. N. and B. D. Ripley (2002)
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    R:Venables+Ripley:2002}
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  \emph{Modern Applied Statistics with S}, Springer-Verlag.
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}
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}
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\seealso{
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\seealso{
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  \code{\link{biplot.prcomp}}, \code{\link{screeplot}},
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  \code{\link{biplot.prcomp}}, \code{\link{screeplot}},
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  \code{\link{princomp}}, \code{\link{cor}}, \code{\link{cov}},
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  \code{\link{princomp}}, \code{\link{cor}}, \code{\link{cov}},
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  \code{\link{svd}}, \code{\link{eigen}}.
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  \code{\link{svd}}, \code{\link{eigen}}.