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Youden Index Calculator

Find the Youden J index from sensitivity and specificity.

Calculated Output

Youden index (J) 0.75

Formula: J = sensitivity + specificity - 1

Step-by-Step Breakdown

1. Values used:

2. Sensitivity = 90 %

3. Specificity = 85 %

5. Youden index (J) = 0.75

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The math behind it

J = sensitivity + specificity - 1, ranging from 0 (useless) to 1 (perfect).

90% sensitivity, 85% specificity gives J = 0.75.

What is it used for?

Choosing the optimal cutoff point on an ROC curve.