biplot-methods: Biplot for Principal Components (objects of class 'Pca')
Description
Produces a biplot from an object (derived from) Pca-class.
Usage
# S4 method for Pca
biplot(x, choices=1L:2L, scale=1, ...)
Arguments
x
an object of class (derived from) "Pca".
choices
length 2 vector specifying the components to plot. Only the default is a biplot in the strict sense.
scale
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.
Side Effects
a plot is produced on the current graphics device.
Methods
biplot
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.
References
Gabriel, K. R. (1971).
The biplot graphical display of matrices with applications to
principal component analysis.
Biometrika, 58, 453--467.