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Four-fifths rule checker

Enter the selection (or pass) rate for two groups. If the ratio between them falls below 0.8, the process may have adverse impact and warrants review.

Impact ratio
0.75
Below 0.8 — review for adverse impact

A screening heuristic from the 1978 Uniform Guidelines, not a verdict. A failed ratio is a reason to investigate; a passed one does not prove fairness.

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