title: GGPlot2 Boxplot only shows flat lines
body: <p>I have been working on this for hours, cant seem to get this right. The boxplot only gives me flat vertical lines, its driving me crazy. I get the same input with or without factor function</p>
  
  <pre><code>ggplot(df2,aes(x = factor(Location),y=Final.Result)) + geom_boxplot()
  </code></pre>
  
  <p>Solved! there are some data values such as "&lt; 0.005" which R picks up as string and converts everything to factor.</p>