Here are the formulas for #sensitivity, #specificity, #negative predictive value (NPV), and #positive predictive value (PPV):
Sensitivity (True Positive Rate)
Sensitivity = TP / (TP + FN)
Specificity (True Negative Rate)
Specificity = TN / (TN + FP)
Positive Predictive Value (PPV)
PPV = TP / (TP + FP)
Negative Predictive Value (NPV)
NPV = TN / (TN + FN)
Where:
- TP = True Positives (correctly identified as having the condition)
- TN = True Negatives (correctly identified as not having the condition)
- FP = False Positives (incorrectly identified as having the condition)
- FN = False Negatives (incorrectly identified as not having the condition)
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