title: WEKA: Plotting the Weighted threshold Curve
body: <p>Given an evaluation result you can plot the area under ROC-Curve for a certain class.</p>
  
  <p>I am more interested in the overall-performance of my classifier.</p>
  
  <p>WEKA provides only the weighted (averaged over all classes) area under ROC as a single double value.</p>
  
  <p>Is there a possibility to generate a plot of the ROC-Curve summarized over all target classes either via GUI or programmatically (java)?</p>
  
  <p>If not, (how) can I compute it by hand? I read a  bit about area under ROC but I don't know how to obtain the (x,y)-pairs. (Plotting of graphs is allready realized.)</p>