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Specifity and sensitivity are defined as\cite{Fawcett_2006}  \[  \text{sensitivity} = \frac{positives correctly classified}{total positives} = \frac{2546}{2546+363} = 87.52 \% \%\\    \text{specificity} = \frac{true negatives}{true negatives + false positives} = \frac{4556}{4556+255} = 94.70 \%  \]