Clinical
Youden's J
Implemented
clinical.youden_jDefinition
Single summary of sensitivity and specificity at one threshold.
Formula
J = Sensitivity + Specificity − 1
Range: [−1, 1]
Inputs and outputs
- y_true: binary reference standard
- y_pred: binary test result
Returns: float
Assumptions
No assumptions beyond valid, aligned inputs of the documented types.
Limitations
- Weights false positives and false negatives equally, which rarely matches clinical costs.
Python API
import evalsuite as es
es.youden_j(y_true, y_pred)References
- Youden, W. J. (1950). Index for rating diagnostic tests. Cancer, 3(1), 32–35.