Fairness Threshold Explorer

Set separate decision thresholds by subgroup and watch sensitivity, specificity and PPV trade off against one another.

fairness
thresholds
subgroup
equal opportunity

Sensitivity gap (M−F)

0.097

Specificity gap (M−F)

-0.037

PPV gap (M−F)

0.032

Prevalence (M / F)

0.304 / 0.208

Fairness metrics by group

Thresholds are set independently per group above.
Group	N	Prevalence	Sensitivity	Specificity	PPV
Male	260.000	0.304	0.937	0.895	0.796
Female	240.000	0.208	0.840	0.932	0.764
Difference (M−F)	—	—	0.097	-0.037	0.032

Predicted probability distributions by group

MaleFemale

You cannot equalize everything at once

With unequal base rates and imperfect discrimination, no single pair of thresholds can equalize sensitivity, specificity and PPV simultaneously (the impossibility result of Chouldechova/Kleinberg et al.). Choosing which fairness criterion to satisfy is a value judgment, not a technical one.

Preparing the simulation…