Plotting pca biplot with ggplot2

Question

I wonder if it is possible to plot pca biplot results with ggplot2. Suppose if I want to display the following biplot results with ggplot2

fit <- princomp(USArrests, cor=TRUE) summary(fit) biplot(fit) 

Any help will be highly appreciated. Thanks

Answer 1

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.

Answer 2

Here is the simplest way through ggbiplot:

library(ggbiplot) fit <- princomp(USArrests, cor=TRUE) biplot(fit) 

ggbiplot(fit, labels =  rownames(USArrests))