title: Include a comma separator for data labels
body: <p>I have a box plot using <code>ggplot</code> which lists the data labels, but am not able to bring a comma separator for 1000s in the data label. <code>sep =","</code> in <code>aes</code> doesn't seem to do the trick.</p>
  
  <pre><code>ggplot(based,aes(x=Cust=Claim.USD)) +
    geom_boxplot() +
    geom_text(data=subset(based,USD&gt;10000), aes(label=USD, sep=","),
              hjust=1, vjust=1)+
    scale_y_continuous(labels=comma)
  </code></pre>