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an observation so distant from the central mass of the data that it noticeably influences results and must be carefully checked to ensure it is not an error.
An observation that differs so widely from all others in a set as to justify the conclusion that a gross error has occurred or that it comes from a different population.
outlier/out·li·er/ (out´li-er) an observation so distant from the central mass of the data that it noticeably influences results.
1 (in managed care) a case in which costs exceed the allowable amount for the specific diagnosis or treatment. The outlier amount is typically specified in advance in the contract between the provider and payer.
2 (in research) an observation that differs from all others, suggesting that a gross error has occurred in sampling, measurement, or analysis.
outlierAny value outside of an expected range.
outlierManaged care A Pt who falls outside of the norm–ie, who has an extremely long length of hospital stay or has incurred extraordinarily high costs. See Extreme outlier, High mortality outlier.
1. Deviant values or figures that are obviously from a different population than those from the rest of the sample.
2. Additions to an estimated cost of delivered services when exceeding a fixed loss threshold.
an extremely high or low value lying beyond the range of the bulk of the data.