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pr.vrb
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\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}