An implementation of the biplot using ggplot2. The package provides two functions: ggscreeplot() and ggbiplot().
ggbiplot aims to be a drop-in replacement for the built-in R function biplot.princomp() with extended functionality
for labeling groups, drawing a correlation circle, and adding Normal probability ellipsoids.
The development of this software was supported in part by NSF Postdoctoral Fellowship DMS-0903120
library(devtools)
install_github("vqv/ggbiplot")
library(ggbiplot)
data(wine)
wine.pca <- prcomp(wine, scale. = TRUE)
g <- ggbiplot(wine.pca, obs.scale = 1, var.scale = 1,
groups = wine.class, ellipse = TRUE, circle = TRUE)
g <- g + scale_color_discrete(name = '')
g <- g + opts(legend.direction = 'horizontal',
legend.position = 'top')
print(g)