ProbabilisticModel 혹은 예측모듈, Computational methods가 제대로 동작하는가를 평가하는것.

Four classes
 * FalsePositive
 * FalseNegative
 * TruePositive
 * TrueNegative

See also WikiPedia:Type_I_and_type_II_errors

{{{#!latex
$$ Sensitivity = \frac{TP}{TP + FN} $$
}}}

{{{#!latex
$$ Specificity = \frac{TN}{TN + FP} $$
}}}

Receiver-operator characteristic: TP vs. FP
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See also SignalDetectionTheory