Produces a biplot from an object (derived from) Pca-class.
# S4 method for Pca
biplot(x, choices=1L:2L, scale=1, ...)
an object of class (derived from) "Pca".
length 2 vector specifying the components to plot. Only the default is a biplot in the strict sense.
The variables are scaled by lambda ^ scale and the
observations are scaled by lambda ^ (1-scale) where
lambda are the singular values as computed by
the Principal Components function. Normally 0 <= scale <= 1, and a warning
will be issued if the specified scale is outside this range.
optional arguments to be passed to the internal graphical functions.
a plot is produced on the current graphics device.
signature(x = Pca): Plot a biplot, i.e. represent both
the observations and variables of a matrix of multivariate data on the same
plot. See also biplot.princomp.
Gabriel, K. R. (1971). The biplot graphical display of matrices with applications to principal component analysis. Biometrika, 58, 453--467.
Pca-class,
PcaClassic,
PcaRobust-class.
require(graphics)
biplot(PcaClassic(USArrests, k=2))
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