Plotting pca biplot with ggplot2
Maybe this will help-- it's adapted from code I wrote some time back. It now draws arrows as well.
PCbiplot <- function(PC, x="PC1", y="PC2") {
# PC being a prcomp object
data <- data.frame(obsnames=row.names(PC$x), PC$x)
plot <- ggplot(data, aes_string(x=x, y=y)) + geom_text(alpha=.4, size=3, aes(label=obsnames))
plot <- plot + geom_hline(aes(0), size=.2) + geom_vline(aes(0), size=.2)
datapc <- data.frame(varnames=rownames(PC$rotation), PC$rotation)
mult <- min(
(max(data[,y]) - min(data[,y])/(max(datapc[,y])-min(datapc[,y]))),
(max(data[,x]) - min(data[,x])/(max(datapc[,x])-min(datapc[,x])))
)
datapc <- transform(datapc,
v1 = .7 * mult * (get(x)),
v2 = .7 * mult * (get(y))
)
plot <- plot + coord_equal() + geom_text(data=datapc, aes(x=v1, y=v2, label=varnames), size = 5, vjust=1, color="red")
plot <- plot + geom_segment(data=datapc, aes(x=0, y=0, xend=v1, yend=v2), arrow=arrow(length=unit(0.2,"cm")), alpha=0.75, color="red")
plot
}
fit <- prcomp(USArrests, scale=T)
PCbiplot(fit)
You may want to change size of text, as well as transparency and colors, to taste; it would be easy to make them parameters of the function.
Note: it occurred to me that this works with prcomp but your example is with princomp. You may, again, need to adapt the code accordingly.
Note2: code for geom_segment()
is borrowed from the mailing list post linked from comment to OP.
Here is the simplest way through ggbiplot
:
library(ggbiplot)
fit <- princomp(USArrests, cor=TRUE)
biplot(fit)
ggbiplot(fit, labels = rownames(USArrests))