\frametitle{Performance Evaluation \cont}

   \structure{Receiver Operating Characteristic (ROC) Curves}

   \begin{itemize}
      \item A classifier defines a single 2-d point in the ROC graph. \\[.7cm]
   \end{itemize}

   \begin{columns}
      \column{.4\linewidth}
      \resizebox{1.4\linewidth}{!}{
         \input{\texfigdir/roc.pstex_t}
      }
      %
      \column{.6\linewidth}
      \footnotesize
      \vspace{-4.0cm}
      \begin{itemize}
         \item[(1)] Perfect classifier: no false positives, all negatives are classified as negatives
         \item[(2)] Random decision: half of positives are classified correctly, half of negatives are classified
           correctly
         \item[(3)] Low true positive rate, but lower false positive rate; strong evidence for positive classification
         \item[(4)] Here something goes really wrong!
      \end{itemize}
   \end{columns}