title: How to Plot "Reverse" Cumulative Frequency Graph With ECDF
body: <p>I have no problem plotting the following cumulative <strong>frequency</strong> graph plot
  like this.</p>
  
  <pre><code>     library(Hmisc)
       pre.test &lt;- rnorm(100,50,10)
       post.test &lt;- rnorm(100,55,10)
       x &lt;- c(pre.test, post.test)
       g &lt;- c(rep('Pre',length(pre.test)),rep('Post',length(post.test)))
       Ecdf(x, group=g, what="f", xlab='Test Results', label.curves=list(keys=1:2))
  </code></pre>
  
  <p>But I want to show the graph in forms of the "reverse" cumulative frequency of values > x.
  (i.e. something equivalent to what="1-f").</p>
  
  <p>Is there a way to do it?</p>
  
  <p>Other suggestions in R other than using Hmisc are also very much welcomed.</p>