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    <p>Maybe this will help-- it's adapted from code I wrote some time back. It now draws arrows as well.</p> <pre><code>PCbiplot &lt;- function(PC, x="PC1", y="PC2") { # PC being a prcomp object data &lt;- data.frame(obsnames=row.names(PC$x), PC$x) plot &lt;- ggplot(data, aes_string(x=x, y=y)) + geom_text(alpha=.4, size=3, aes(label=obsnames)) plot &lt;- plot + geom_hline(aes(0), size=.2) + geom_vline(aes(0), size=.2) datapc &lt;- data.frame(varnames=rownames(PC$rotation), PC$rotation) mult &lt;- 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 &lt;- transform(datapc, v1 = .7 * mult * (get(x)), v2 = .7 * mult * (get(y)) ) plot &lt;- plot + coord_equal() + geom_text(data=datapc, aes(x=v1, y=v2, label=varnames), size = 5, vjust=1, color="red") plot &lt;- 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 &lt;- prcomp(USArrests, scale=T) PCbiplot(fit) </code></pre> <p>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 <code>geom_segment()</code> is borrowed from the mailing list post linked from comment to OP.</p> <p><img src="https://i.stack.imgur.com/nATw1.png" alt="PC biplot"></p>
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    1. COI'd like to add names of observations as well as arrows for variables. Any idea?
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    2. CODone -- hope it helps!
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    3. COSmall update for version 0.9 of ggplot2, you now need to add library("ggplot2") and library("grid") to plot arrows.
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