title: adding correlation test results to ggplot
body: <p>I'm trying to create a <code>ggplot</code> and add results of a correlation test I have done.
  Something along the lines of:</p>
  
  <pre><code>p+annotate("text",x=12.5,y=15.25,label=c(cor.test$estimate,cor.test$p.value))
  </code></pre>
  
  <p>I keep getting error messages no matter what I try.
  Any ideas?</p>