biplot.princomp | R Documentation |
Produces a biplot (in the strict sense) from the output of
princomp
or prcomp
## S3 method for class 'prcomp' biplot(x, choices = 1:2, scale = 1, pc.biplot = FALSE, ...) ## S3 method for class 'princomp' biplot(x, choices = 1:2, scale = 1, pc.biplot = FALSE, ...)
x |
an object of class |
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 |
pc.biplot |
If true, use what Gabriel (1971) refers to as a "principal component
biplot", with |
... |
optional arguments to be passed to
|
This is a method for the generic function biplot
. There is
considerable confusion over the precise definitions: those of the
original paper, Gabriel (1971), are followed here. Gabriel and
Odoroff (1990) use the same definitions, but their plots actually
correspond to pc.biplot = TRUE
.
a plot is produced on the current graphics device.
Gabriel, K. R. (1971). The biplot graphical display of matrices with applications to principal component analysis. Biometrika, 58, 453–467. \Sexpr[results=rd,stage=build]{tools:::Rd_expr_doi("10.2307/2334381")}.
Gabriel, K. R. and Odoroff, C. L. (1990). Biplots in biomedical research. Statistics in Medicine, 9, 469–485. \Sexpr[results=rd,stage=build]{tools:::Rd_expr_doi("10.1002/sim.4780090502")}.
biplot
,
princomp
.
require(graphics) biplot(princomp(USArrests))
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