title: Specifying custom error bars in ggplot2 when using facet_grid
body: <p>I have created multiple bar charts from my data, using <code>stat_summary</code>. However, I want to manually specify the limits of the error bars (instead of using <code>mean_cl_boot</code>). How can this be done for data graphed using <code>facet_grid</code>?</p>
  
  <p>The code I used to create the charts is below:</p>
  
  <pre><code>graph &lt;- ggplot(slantclean, aes(x = View,value, fill = Texture))
  
  graph + stat_summary(fun.y = mean, geom = "bar", position = "dodge") + 
       stat_summary(fun.data = mean_cl_boot, geom = "pointrange", 
                       position = position_dodge(width = 0.90)) + 
       labs(x = "View", y = "Vertical height of ellipse (cm)", fill = "Texture") + 
       facet_grid( Shape ~ TNOGroup)
  </code></pre>
  
  <p>Unfortunately, the complex nature of the data means that a minimal example is impossible. The data frame can be accessed <a href="https://www.dropbox.com/s/qs5sq1yjomiaqe3/data.Rda" rel="nofollow">here</a>. An example of the plot is <a href="http://i.imgur.com/HRTOqPQ.png" rel="nofollow">here</a>.</p>