42 CFR § 423.182
[Amendment] Part D Prescription Drug Plan Quality Rating System
June 11, 2020
(a) * * *
Tukey outer fence outliers are measure scores that are below a certain point (first quartile−3.0 × (third quartile−first quartile)) or above a certain point (third quartile + 3.0 × (third quartile−first quartile)).
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